Roll DEPS to pick up ffmpeg sidx box fixes.

BUG=738595
TEST=existing tests pass
TBR=wolenetz

Change-Id: I1076fc1a74b7064bff021c5c124f20216fc0867e
Reviewed-on: https://chromium-review.googlesource.com/578656Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488140}

DEPS

@@ -208,7 +208,7 @@ deps = {
     Var('chromium_git') + '/webm/libvpx.git' + '@' +  'b578d59623ddb0f3f76efe5e160aff253b40d19b',
 
   'src/third_party/ffmpeg':
-    Var('chromium_git') + '/chromium/third_party/ffmpeg.git' + '@' + 'f82eb1989c0cdd5ed179ee4979ffb18a8030c78a',
+    Var('chromium_git') + '/chromium/third_party/ffmpeg.git' + '@' + 'd19b0ad9b26a4def3411e32a8b780540afbd6a6e',
 
   'src/third_party/usrsctp/usrsctplib':
     Var('chromium_git') + '/external/github.com/sctplab/usrsctp' + '@' + '2f6478eb8d40f1766a96b5b033ed26c0c2244589',