Roll src/third_party/ffmpeg d4b1674:f5698b4

Summary of changes available at:
https://chromium.googlesource.com/chromium/third_party/ffmpeg/+log/d4b1674..f5698b4

BUG=344767

Review URL: https://codereview.chromium.org/938223003

Cr-Commit-Position: refs/heads/master@{#317706}

DEPS

@@ -207,7 +207,7 @@ deps = {
    Var('chromium_git') + '/chromium/deps/libvpx.git' + '@' +  Var('libvpx_revision'),
 
   'src/third_party/ffmpeg':
-   Var('chromium_git') + '/chromium/third_party/ffmpeg.git' + '@' + 'd4b1674dcd2f742403179a3ef8e6dd8d7aaecf1a',
+   Var('chromium_git') + '/chromium/third_party/ffmpeg.git' + '@' + 'f5698b4f3e3e8eacad18d77cf69882fe14015de5',
 
   'src/third_party/libjingle/source/talk':
     Var('chromium_git') + '/external/webrtc/trunk/talk.git' + '@' + '0366d0b6d9dddb3d775d7ed8919c56a729cfe82f',