Set AVFMT_FLAG_GENPTS when demuxing AVI content.

content/browser/media/media_browsertest.cc

Index: content/browser/media/media_browsertest.cc
diff --git a/content/browser/media/media_browsertest.cc b/content/browser/media/media_browsertest.cc
index ec70dcded5d29a338d5d80712d6fc1018ad2b26e..ccdd68808c93571d1d1af5435c5502ba031097ac 100644
--- a/content/browser/media/media_browsertest.cc
+++ b/content/browser/media/media_browsertest.cc
@@ -123,10 +123,7 @@ IN_PROC_BROWSER_TEST_P(MediaTest, VideoBearAviMp3Mpeg4) {
   PlayVideo("bear_mpeg4_mp3.avi", GetParam());
 }
 
-// TODO(scherkus): MPEG-4 ASP contains B-frames and out-of-order decoding, which
-// makes FFmpeg spit out video frames with no timestamp. As a result we DCHECK()
-// all over the place http://crbug.com/169570
-IN_PROC_BROWSER_TEST_P(MediaTest, DISABLED_VideoBearAviMp3Mpeg4Asp) {
+IN_PROC_BROWSER_TEST_P(MediaTest, VideoBearAviMp3Mpeg4Asp) {
   PlayVideo("bear_mpeg4asp_mp3.avi", GetParam());
 }