Roll src/third_party/ffmpeg/ bcc5d9fec..4ae2e9779 (2 commits)

https://chromium.googlesource.com/chromium/third_party/ffmpeg.git/+log/bcc5d9fec0a3..4ae2e9779046

$ git log bcc5d9fec..4ae2e9779 --date=short --no-merges --format='%ad %ae %s'
2020-02-20 thakis Remove optimize_no_wpo in ffmpeg.
2020-01-30 tmathmeyer Fix memory leak in mov_read_pssh

Created with:
  roll-dep src/third_party/ffmpeg

Bug: 1053958,598772,1018745
Change-Id: I7b382c4d0b5c01a8cc2bba59b65a0fd888dca382
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2067438
Commit-Queue: Nico Weber <thakis@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743243}

DEPS

@@ -911,7 +911,7 @@ deps = {
   },
 
   'src/third_party/ffmpeg':
-    Var('chromium_git') + '/chromium/third_party/ffmpeg.git' + '@' + 'bcc5d9fec0a32ec5a90b831e5d0414639af34e1f',
+    Var('chromium_git') + '/chromium/third_party/ffmpeg.git' + '@' + '4ae2e97790467cf3153b6d206e0d46a7637c0101',
 
   'src/third_party/flac':
     Var('chromium_git') + '/chromium/deps/flac.git' + '@' + 'af862024c8c8fa0ae07ced05e89013d881b00596',