Include "ffmpeg.dll" in installer archive.
Include "ffmpeg.dll" in installer archive.

By setting "ffmpeg_component=shared_library" you can build ffmpeg as library
while the rest of Chromium is statically compiled.

In this case, the "ffmpeg.dll" was not included in the installer archive which
is fixed with the CL.

Review URL: https://codereview.chromium.org/1260963007

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#342318}

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