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.

BUG=435455, 429131, 441908
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

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

Cr-Commit-Position: refs/heads/master@{#332891}
64 files changed