Roll src/third_party/ffmpeg/ 3c7a09882..cdf4accee (3188 commits).

media/ffmpeg/ffmpeg_common.h

Index: media/ffmpeg/ffmpeg_common.h
diff --git a/media/ffmpeg/ffmpeg_common.h b/media/ffmpeg/ffmpeg_common.h
index ff8f607b2e02ef2c07c7e51e2ccaeec9dc224aa4..8dde759835efaa78e2cfd0b93ab71c0500bc70b1 100644
--- a/media/ffmpeg/ffmpeg_common.h
+++ b/media/ffmpeg/ffmpeg_common.h
@@ -144,9 +144,10 @@ AVPixelFormat VideoPixelFormatToAVPixelFormat(VideoPixelFormat video_format);
 ColorSpace AVColorSpaceToColorSpace(AVColorSpace color_space,
                                     AVColorRange color_range);
 
-// Convert FFmpeg UTC representation (YYYY-MM-DD HH:MM:SS) to base::Time.
+// Convert FFmpeg UTC representation (YYYY-MM-DDTHH:MM:SS.xxxxxxZ) to
+// base::Time.
 // Returns true and sets |*out| if |date_utc| contains a valid
-// date string. Otherwise returns fals and timeline_offset is unmodified.
+// date string. Otherwise returns false and |out| is unmodified.
 MEDIA_EXPORT bool FFmpegUTCDateToTime(const char* date_utc, base::Time* out);
 
 // Returns a 32-bit hash for the given codec name.  See the VerifyUmaCodecHashes