Update the chromium patch[1] to match the latest ffmpeg git master
changes[2]. AVStream does not have the 'AVStreamInternal* internal'
field anymore, and AVStreamInternal struct does not exist anymore
either. The equivalent is now FFStream, and it should now be
accessed by 'FFStream* ffstream(AVStream*)'.
References
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[1] 95aab0fd83%5E%21/
[2] 40bdd8cc05
