Remove redundant I420-to-YV12 conversion in MediaStreamVideoTrack.

ppapi/tests/test_media_stream_video_track.cc

Index: ppapi/tests/test_media_stream_video_track.cc
diff --git a/ppapi/tests/test_media_stream_video_track.cc b/ppapi/tests/test_media_stream_video_track.cc
index 10f7f9793b8edb1729aca9cb71175cdc1c255bc3..b4f01863ce69b4b298f01935bced81084432fc4a 100644
--- a/ppapi/tests/test_media_stream_video_track.cc
+++ b/ppapi/tests/test_media_stream_video_track.cc
@@ -98,7 +98,8 @@ std::string TestMediaStreamVideoTrack::TestGetFrame() {
     ASSERT_EQ(PP_OK, cc.result());
     pp::VideoFrame frame = cc.output();
     ASSERT_FALSE(frame.is_null());
-    ASSERT_EQ(frame.GetFormat(), PP_VIDEOFRAME_FORMAT_YV12);
+    ASSERT_TRUE(frame.GetFormat() == PP_VIDEOFRAME_FORMAT_YV12 ||
+                frame.GetFormat() == PP_VIDEOFRAME_FORMAT_I420);
 
     pp::Size size;
     ASSERT_TRUE(frame.GetSize(&size));
@@ -164,7 +165,13 @@ std::string TestMediaStreamVideoTrack::TestConfigure() {
       ASSERT_EQ(PP_OK, cc2.result());
       pp::VideoFrame frame = cc2.output();
       ASSERT_FALSE(frame.is_null());
-      ASSERT_EQ(frame.GetFormat(), formats[i].expected_format);
+      if (formats[i].format != PP_VIDEOFRAME_FORMAT_UNKNOWN) {
+        ASSERT_EQ(frame.GetFormat(), formats[i].expected_format);
+      } else {
+        // Both YV12 and I420 are acceptable as default YUV formats.
+        ASSERT_TRUE(frame.GetFormat() == PP_VIDEOFRAME_FORMAT_YV12 ||
+                    frame.GetFormat() == PP_VIDEOFRAME_FORMAT_I420);
+      }
 
       pp::Size size;
       ASSERT_TRUE(frame.GetSize(&size));
@@ -206,7 +213,8 @@ std::string TestMediaStreamVideoTrack::TestConfigure() {
       ASSERT_EQ(PP_OK, cc2.result());
       pp::VideoFrame frame = cc2.output();
       ASSERT_FALSE(frame.is_null());
-      ASSERT_EQ(frame.GetFormat(), PP_VIDEOFRAME_FORMAT_YV12);
+      ASSERT_TRUE(frame.GetFormat() == PP_VIDEOFRAME_FORMAT_YV12 ||
+                  frame.GetFormat() == PP_VIDEOFRAME_FORMAT_I420);
 
       pp::Size size;
       ASSERT_TRUE(frame.GetSize(&size));