[Merge to M44] Chromium changes to statically link ffmpeg.

Motivations:
1. Eliminates a large number of windows crashes hit while loading the DLL (see bugs)
2. Reducing the size of binary (about 400KB on linux, about 265KB on 32bit windows) due to dead-code elimination
3. Simplifying media library initialization (Remove bool-ness, it just works)

Licensing:
We've audited all the licenses for the files we actually use and have the green light from legal as long as we include the license text in the credits.

TBR=thomasvl@chromium.org, dalecurtis@chromium.org, enne@chromium.org, grt@chromium.org, gunsch@chromium.org, isherman@chromium.org, jamiewalch@chromium.org, jochen@chromium.org, maruel@chromium.org, mmoss@google.com, phajdan.jr@chromium.org, sergeyu@chromium.org, sky@chromium.org
BUG=435455, 429131, 441908
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Original Review URL:
https://codereview.chromium.org/1141703002

(cherry picked from commit fd11b3c3aa6730ae1f024811b61913cd63f9d39a - refs/heads/master@{#333423})

Review URL: https://codereview.chromium.org/1179953006.

Cr-Commit-Position: refs/branch-heads/2403@{#342}
Cr-Branched-From: f54b8097a9c45ed4ad308133d49f05325d6c5070-refs/heads/master@{#330231}
63 files changed