Enable cpplint for webrtc/examples and fix all uncovered cpplint errors.

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 254fb946f905b50327998c9f4bf64ac5f4bbbb97..6811a491d5dffcce10447149fba947d5e3f28160 100644
--- a/webrtc/examples/peerconnection/client/linux/main_wnd.cc
+++ b/webrtc/examples/peerconnection/client/linux/main_wnd.cc
@@ -116,7 +116,8 @@ gboolean Redraw(gpointer data) {
   wnd->OnRedraw();
   return false;
 }
-}  // end anonymous
+
+}  // namespace
 
 //
 // GtkMainWnd implementation.
@@ -174,7 +175,8 @@ void GtkMainWnd::StopLocalRenderer() {
   local_renderer_.reset();
 }
 
-void GtkMainWnd::StartRemoteRenderer(webrtc::VideoTrackInterface* remote_video) {
+void GtkMainWnd::StartRemoteRenderer(
+    webrtc::VideoTrackInterface* remote_video) {
   remote_renderer_.reset(new VideoRenderer(this, remote_video));
 }