Copy libvpx from DEPS to src

media/capture/video/file_video_capture_device.cc

Index: media/capture/video/file_video_capture_device.cc
diff --git a/media/capture/video/file_video_capture_device.cc b/media/capture/video/file_video_capture_device.cc
index b7c902e1a55c48494611ce2de6378ab995b3ac06..073c0a13254c68dfec20c82ad454af3481395f68 100644
--- a/media/capture/video/file_video_capture_device.cc
+++ b/media/capture/video/file_video_capture_device.cc
@@ -44,7 +44,7 @@ void ParseY4MRational(const base::StringPiece& token,
 // character, however all examples mentioned in the Y4M header description end
 // with a newline character instead. Also, some headers do _not_ specify pixel
 // format, in this case it means I420.
-// This code was inspired by third_party/libvpx/.../y4minput.* .
+// This code was inspired by third_party/libvpx_new/.../y4minput.* .
 void ParseY4MTags(const std::string& file_header,
                   media::VideoCaptureFormat* video_format) {
   media::VideoCaptureFormat format;