Revert of Change the video color space default.

media/base/test_helpers.cc

Index: media/base/test_helpers.cc
diff --git a/media/base/test_helpers.cc b/media/base/test_helpers.cc
index 2b108ff90cced88d3264af59ee685d0cddb59e7f..f4ba9915007b62ce793e9429c5f656b5690c96c8 100644
--- a/media/base/test_helpers.cc
+++ b/media/base/test_helpers.cc
@@ -126,9 +126,8 @@
   gfx::Size natural_size = coded_size;
 
   return VideoDecoderConfig(codec, VIDEO_CODEC_PROFILE_UNKNOWN,
-                            VideoFrame::YV12,
-                            VideoFrame::COLOR_SPACE_UNSPECIFIED, coded_size,
-                            visible_rect, natural_size, NULL, 0, is_encrypted);
+      VideoFrame::YV12, coded_size, visible_rect, natural_size,
+      NULL, 0, is_encrypted);
 }
 
 static const gfx::Size kNormalSize(320, 240);