V4L2VDA: Fix compilation after VideoDecodeAcceleratorImpl removal.

crrev.com/275621 broke compilation of Chrome for CrOS ARM on a missing
include after removal of VideoDecodeAcceleratorImpl. Add the missing include.

TBR=scherkus@chromium.org,spang@chromium.org
BUG=None
TEST=Compile Chrome for CrOS ARM

Review URL: https://codereview.chromium.org/323793002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@275775 0039d316-1c4b-4281-b951-d872f2087c98

content/common/gpu/media/v4l2_video_decode_accelerator.h

@@ -22,6 +22,7 @@
 #include "media/base/limits.h"
 #include "media/base/video_decoder_config.h"
 #include "media/video/picture.h"
+#include "media/video/video_decode_accelerator.h"
 #include "ui/gfx/size.h"
 #include "ui/gl/gl_bindings.h"