Add RTC_ prefix to (D)CHECKs and related macros.

webrtc/common_video/video_frame.cc

Index: webrtc/common_video/video_frame.cc
diff --git a/webrtc/common_video/video_frame.cc b/webrtc/common_video/video_frame.cc
index 0ebb9835d55f593be62dcf77cded48dd6402fb9c..7cdbd53f9d41cc8ff71d99f09ead95005375650e 100644
--- a/webrtc/common_video/video_frame.cc
+++ b/webrtc/common_video/video_frame.cc
@@ -42,11 +42,11 @@ int VideoFrame::CreateEmptyFrame(int width,
                                  int stride_u,
                                  int stride_v) {
   const int half_width = (width + 1) / 2;
-  DCHECK_GT(width, 0);
-  DCHECK_GT(height, 0);
-  DCHECK_GE(stride_y, width);
-  DCHECK_GE(stride_u, half_width);
-  DCHECK_GE(stride_v, half_width);
+  RTC_DCHECK_GT(width, 0);
+  RTC_DCHECK_GT(height, 0);
+  RTC_DCHECK_GE(stride_y, width);
+  RTC_DCHECK_GE(stride_u, half_width);
+  RTC_DCHECK_GE(stride_v, half_width);
 
   // Creating empty frame - reset all values.
   timestamp_ = 0;
@@ -195,7 +195,7 @@ void VideoFrame::set_video_frame_buffer(
 }
 
 VideoFrame VideoFrame::ConvertNativeToI420Frame() const {
-  DCHECK(native_handle());
+  RTC_DCHECK(native_handle());
   VideoFrame frame;
   frame.ShallowCopy(*this);
   frame.set_video_frame_buffer(video_frame_buffer_->NativeToI420Buffer());