Revert 51062 - ffmpeg update to new version of ffmpeg june 16 and libvpx 0.9.1

BUG=none
TEST=videos should still play

Review URL: http://codereview.chromium.org/2862017

TBR=fbarchard@chromium.org
Review URL: http://codereview.chromium.org/2818034

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@51071 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -2,12 +2,12 @@ vars = {
   "webkit_trunk":
   "http://svn.webkit.org/repository/webkit/trunk",
   "webkit_revision": "62028",
-  "ffmpeg_revision": "51060",
+  "ffmpeg_revision": "49485",
   "skia_revision": "583",
   "chromium_git": "http://src.chromium.org/git",
   "swig_revision": "40423",
   "nacl_revision": "2555",
-  "libvpx_revision": "51060",
+  "libvpx_revision": "47941",
   "libjingle_revision": "21",
 }