Replace NULL with nullptr in all C++ files.

webrtc/examples/peerconnection/client/linux/main_wnd.cc

Index: webrtc/examples/peerconnection/client/linux/main_wnd.cc
diff --git a/webrtc/examples/peerconnection/client/linux/main_wnd.cc b/webrtc/examples/peerconnection/client/linux/main_wnd.cc
index 55a59aea2cb8682d154433510bb849d6cbd58287..cfa5b39ac62f9b90387f66dc894bfcfca6ab5d81 100644
--- a/webrtc/examples/peerconnection/client/linux/main_wnd.cc
+++ b/webrtc/examples/peerconnection/client/linux/main_wnd.cc
@@ -60,8 +60,8 @@ gboolean SimulateLastRowActivated(gpointer data) {
   GtkTreeView* tree_view = reinterpret_cast<GtkTreeView*>(data);
   GtkTreeModel* model = gtk_tree_view_get_model(tree_view);
 
-  // "if iter is NULL, then the number of toplevel nodes is returned."
-  int rows = gtk_tree_model_iter_n_children(model, NULL);
+  // "if iter is null, then the number of toplevel nodes is returned."
+  int rows = gtk_tree_model_iter_n_children(model, nullptr);
   GtkTreePath* lastpath = gtk_tree_path_new_from_indices(rows - 1, -1);
 
   // Select the last item in the list
@@ -81,7 +81,7 @@ gboolean SimulateLastRowActivated(gpointer data) {
 void InitializeList(GtkWidget* list) {
   GtkCellRenderer* renderer = gtk_cell_renderer_text_new();
   GtkTreeViewColumn* column = gtk_tree_view_column_new_with_attributes(
-      "List Items", renderer, "text", 0, NULL);
+      "List Items", renderer, "text", 0, nullptr);
   gtk_tree_view_append_column(GTK_TREE_VIEW(list), column);
   GtkListStore* store = gtk_list_store_new(2, G_TYPE_STRING, G_TYPE_INT);
   gtk_tree_view_set_model(GTK_TREE_VIEW(list), GTK_TREE_MODEL(store));
@@ -131,11 +131,20 @@ gboolean Draw(GtkWidget* widget, cairo_t* cr, gpointer data) {
 // GtkMainWnd implementation.
 //
 
-GtkMainWnd::GtkMainWnd(const char* server, int port, bool autoconnect,
+GtkMainWnd::GtkMainWnd(const char* server,
+                       int port,
+                       bool autoconnect,
                        bool autocall)
-    : window_(NULL), draw_area_(NULL), vbox_(NULL), server_edit_(NULL),
-      port_edit_(NULL), peer_list_(NULL), callback_(NULL),
-      server_(server), autoconnect_(autoconnect), autocall_(autocall) {
+    : window_(nullptr),
+      draw_area_(nullptr),
+      vbox_(nullptr),
+      server_edit_(nullptr),
+      port_edit_(nullptr),
+      peer_list_(nullptr),
+      callback_(nullptr),
+      server_(server),
+      autoconnect_(autoconnect),
+      autocall_(autocall) {
   char buffer[10];
   sprintfn(buffer, sizeof(buffer), "%i", port);
   port_ = buffer;
@@ -150,7 +159,7 @@ void GtkMainWnd::RegisterObserver(MainWndCallback* callback) {
 }
 
 bool GtkMainWnd::IsWindow() {
-  return window_ != NULL && GTK_IS_WINDOW(window_);
+  return window_ != nullptr && GTK_IS_WINDOW(window_);
 }
 
 void GtkMainWnd::MessageBox(const char* caption, const char* text,
@@ -198,7 +207,7 @@ void GtkMainWnd::QueueUIThreadCallback(int msg_id, void* data) {
 }
 
 bool GtkMainWnd::Create() {
-  RTC_DCHECK(window_ == NULL);
+  RTC_DCHECK(window_ == nullptr);
 
   window_ = gtk_window_new(GTK_WINDOW_TOPLEVEL);
   if (window_) {
@@ -213,7 +222,7 @@ bool GtkMainWnd::Create() {
     SwitchToConnectUI();
   }
 
-  return window_ != NULL;
+  return window_ != nullptr;
 }
 
 bool GtkMainWnd::Destroy() {
@@ -221,7 +230,7 @@ bool GtkMainWnd::Destroy() {
     return false;
 
   gtk_widget_destroy(window_);
-  window_ = NULL;
+  window_ = nullptr;
 
   return true;
 }
@@ -230,13 +239,13 @@ void GtkMainWnd::SwitchToConnectUI() {
   LOG(INFO) << __FUNCTION__;
 
   RTC_DCHECK(IsWindow());
-  RTC_DCHECK(vbox_ == NULL);
+  RTC_DCHECK(vbox_ == nullptr);
 
   gtk_container_set_border_width(GTK_CONTAINER(window_), 10);
 
   if (peer_list_) {
     gtk_widget_destroy(peer_list_);
-    peer_list_ = NULL;
+    peer_list_ = nullptr;
   }
 
 #if GTK_MAJOR_VERSION == 2
@@ -289,12 +298,12 @@ void GtkMainWnd::SwitchToPeerList(const Peers& peers) {
     gtk_container_set_border_width(GTK_CONTAINER(window_), 0);
     if (vbox_) {
       gtk_widget_destroy(vbox_);
-      vbox_ = NULL;
-      server_edit_ = NULL;
-      port_edit_ = NULL;
+      vbox_ = nullptr;
+      server_edit_ = nullptr;
+      port_edit_ = nullptr;
     } else if (draw_area_) {
       gtk_widget_destroy(draw_area_);
-      draw_area_ = NULL;
+      draw_area_ = nullptr;
       draw_buffer_.reset();
     }
 
@@ -322,12 +331,12 @@ void GtkMainWnd::SwitchToPeerList(const Peers& peers) {
 void GtkMainWnd::SwitchToStreamingUI() {
   LOG(INFO) << __FUNCTION__;
 
-  RTC_DCHECK(draw_area_ == NULL);
+  RTC_DCHECK(draw_area_ == nullptr);
 
   gtk_container_set_border_width(GTK_CONTAINER(window_), 0);
   if (peer_list_) {
     gtk_widget_destroy(peer_list_);
-    peer_list_ = NULL;
+    peer_list_ = nullptr;
   }
 
   draw_area_ = gtk_drawing_area_new();
@@ -339,12 +348,12 @@ void GtkMainWnd::SwitchToStreamingUI() {
 
 void GtkMainWnd::OnDestroyed(GtkWidget* widget, GdkEvent* event) {
   callback_->Close();
-  window_ = NULL;
-  draw_area_ = NULL;
-  vbox_ = NULL;
-  server_edit_ = NULL;
-  port_edit_ = NULL;
-  peer_list_ = NULL;
+  window_ = nullptr;
+  draw_area_ = nullptr;
+  vbox_ = nullptr;
+  server_edit_ = nullptr;
+  port_edit_ = nullptr;
+  peer_list_ = nullptr;
 }
 
 void GtkMainWnd::OnClicked(GtkWidget* widget) {
@@ -381,7 +390,7 @@ void GtkMainWnd::OnKeyPress(GtkWidget* widget, GdkEventKey* key) {
       case GDK_KEY_Return:
 #endif
         if (vbox_) {
-          OnClicked(NULL);
+          OnClicked(nullptr);
         } else if (peer_list_) {
           // OnRowActivated will be called automatically when the user
           // presses enter.
@@ -396,7 +405,7 @@ void GtkMainWnd::OnKeyPress(GtkWidget* widget, GdkEventKey* key) {
 
 void GtkMainWnd::OnRowActivated(GtkTreeView* tree_view, GtkTreePath* path,
                                 GtkTreeViewColumn* column) {
-  RTC_DCHECK(peer_list_ != NULL);
+  RTC_DCHECK(peer_list_ != nullptr);
   GtkTreeIter iter;
   GtkTreeModel* model;
   GtkTreeSelection* selection =
@@ -415,8 +424,8 @@ void GtkMainWnd::OnRedraw() {
   gdk_threads_enter();
 
   VideoRenderer* remote_renderer = remote_renderer_.get();
-  if (remote_renderer && remote_renderer->image() != NULL &&
-      draw_area_ != NULL) {
+  if (remote_renderer && remote_renderer->image() != nullptr &&
+      draw_area_ != nullptr) {
     width_ = remote_renderer->width();
     height_ = remote_renderer->height();