Move VideoFrame and related declarations to webrtc/api/video.

webrtc/test/fake_decoder.cc

Index: webrtc/test/fake_decoder.cc
diff --git a/webrtc/test/fake_decoder.cc b/webrtc/test/fake_decoder.cc
index 4a35e78921b96f0abf141703e4419653ecd00142..25f80779e2a0ea39a749d658e3e52bd0c4943704 100644
--- a/webrtc/test/fake_decoder.cc
+++ b/webrtc/test/fake_decoder.cc
@@ -10,6 +10,8 @@
 
 #include "webrtc/test/fake_decoder.h"
 
+#include "webrtc/api/video/i420_buffer.h"
+#include "webrtc/base/timeutils.h"
 #include "webrtc/test/gtest.h"
 
 namespace webrtc {