Roll src/third_party/ffmpeg/ bbe6b81a6..458e9fd3f (528 commits)

(Also updates one ffmpeg_regression_tests that now works properly.)

https://chromium.googlesource.com/chromium/third_party/ffmpeg.git/+log/bbe6b81a6c31..458e9fd3f8e8

$ git log bbe6b81a6..458e9fd3f --date=short --no-merges --format='%ad %ae %s'
2018-10-01 liberato Don't rebuild ffmpeg configs / patches / etc. if already committed.
2018-09-28 jrummell Improve handling of .gclient file in script
2018-10-01 liberato Run handy regex to summarize gn file differences.
2018-09-28 liberato Push merge commit and set tracking branch.
2018-09-28 jrummell Chromium patches file
2018-09-28 jrummell GN Configuration
2018-09-14 michael avcodec/diracdec: check that GetBitContext has not ended in codeblock()
2018-09-14 michael avcodec/diracdec: Propagate errors from codeblock()
2018-09-12 michael avcodec/bintext: Use ff_get_buffer instead of ff_reget_buffer and simplify
2018-09-12 michael avcodec/bintext: Check input size before allocating the input image
(...)

Created with:
  roll-dep src/third_party/ffmpeg

BUG=890005

Change-Id: I62781916144e5f9b919e985a0a182efb2e7eb159
Reviewed-on: https://chromium-review.googlesource.com/1255887Reviewed-by: Thomas Guilbert <tguilbert@chromium.org>
Commit-Queue: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595660}

DEPS

@@ -655,7 +655,7 @@ deps = {
   },
 
   'src/third_party/ffmpeg':
-    Var('chromium_git') + '/chromium/third_party/ffmpeg.git' + '@' + 'bbe6b81a6c310d4931cc8a5164d1a374652e054a',
+    Var('chromium_git') + '/chromium/third_party/ffmpeg.git' + '@' + '458e9fd3f8e8c913a739389c65dfaf1f77ee9106',
 
   'src/third_party/flac':
     Var('chromium_git') + '/chromium/deps/flac.git' + '@' + 'af862024c8c8fa0ae07ced05e89013d881b00596',

media/ffmpeg/ffmpeg_regression_tests.cc

@@ -116,10 +116,7 @@ FFMPEG_TEST_CASE(Cr117912,
                  "security/117912.webm",
                  DEMUXER_ERROR_COULD_NOT_OPEN,
                  DEMUXER_ERROR_COULD_NOT_OPEN);
-FFMPEG_TEST_CASE(Cr123481,
-                 "security/123481.ogv",
-                 DEMUXER_ERROR_COULD_NOT_PARSE,
-                 DEMUXER_ERROR_COULD_NOT_PARSE);
+FFMPEG_TEST_CASE(Cr123481, "security/123481.ogv", PIPELINE_OK, PIPELINE_OK);
 FFMPEG_TEST_CASE(Cr132779,
                  "security/132779.webm",
                  DEMUXER_ERROR_COULD_NOT_PARSE,