Replace NULL with nullptr in all C++ files.

webrtc/modules/video_capture/test/video_capture_unittest.cc

Index: webrtc/modules/video_capture/test/video_capture_unittest.cc
diff --git a/webrtc/modules/video_capture/test/video_capture_unittest.cc b/webrtc/modules/video_capture/test/video_capture_unittest.cc
index d0c3ec9b257981c351e4536ca1e02ebec95174fa..5ae36be4f0e162a754a64b0befe46fe09ce21efe 100644
--- a/webrtc/modules/video_capture/test/video_capture_unittest.cc
+++ b/webrtc/modules/video_capture/test/video_capture_unittest.cc
@@ -169,8 +169,8 @@ class VideoCaptureTest : public testing::Test {
 
     rtc::scoped_refptr<VideoCaptureModule> module(
         VideoCaptureFactory::Create(unique_name));
-    if (module.get() == NULL)
-      return NULL;
+    if (module.get() == nullptr)
+      return nullptr;
 
     EXPECT_FALSE(module->CaptureStarted());
 
@@ -206,7 +206,7 @@ TEST_F(VideoCaptureTest, MAYBE_CreateDelete) {
     TestVideoCaptureCallback capture_observer;
     rtc::scoped_refptr<VideoCaptureModule> module(
         OpenVideoCaptureDevice(0, &capture_observer));
-    ASSERT_TRUE(module.get() != NULL);
+    ASSERT_TRUE(module.get() != nullptr);
 
     VideoCaptureCapability capability;
 #ifndef WEBRTC_MAC
@@ -252,7 +252,7 @@ TEST_F(VideoCaptureTest, MAYBE_Capabilities) {
 
   rtc::scoped_refptr<VideoCaptureModule> module(
       OpenVideoCaptureDevice(0, &capture_observer));
-  ASSERT_TRUE(module.get() != NULL);
+  ASSERT_TRUE(module.get() != nullptr);
 
   int number_of_capabilities = device_info_->NumberOfCapabilities(
       module->CurrentDeviceName());
@@ -314,7 +314,7 @@ TEST_F(VideoCaptureTest, DISABLED_TestTwoCameras) {
   TestVideoCaptureCallback capture_observer1;
   rtc::scoped_refptr<VideoCaptureModule> module1(
       OpenVideoCaptureDevice(0, &capture_observer1));
-  ASSERT_TRUE(module1.get() != NULL);
+  ASSERT_TRUE(module1.get() != nullptr);
   VideoCaptureCapability capability1;
 #ifndef WEBRTC_MAC
   device_info_->GetCapability(module1->CurrentDeviceName(), 0, capability1);
@@ -329,8 +329,7 @@ TEST_F(VideoCaptureTest, DISABLED_TestTwoCameras) {
   TestVideoCaptureCallback capture_observer2;
   rtc::scoped_refptr<VideoCaptureModule> module2(
       OpenVideoCaptureDevice(1, &capture_observer2));
-  ASSERT_TRUE(module1.get() != NULL);
-
+  ASSERT_TRUE(module1.get() != nullptr);
 
   VideoCaptureCapability capability2;
 #ifndef WEBRTC_MAC