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We'll have to limit support to P+, since it's otherwise quite a
chore to get the correct MediaCodec status in the renderer.

This also does the following:
- Strips media:: prefix from media/base/supported_types.cc
- Adds warnings to MediaCodecUtil around methods which can't be
used from the renderer process.
- Moves opus support checks to MediaCodecUtil where they belong.
- Moves hevc support checks to MimeUtilInternal::PlatformInfo where
they belong. Expands unit test for this. Updates MediaCodecUtil.java
to accommodate this.
- Removes a unreachable statements from IsCodecSupportedOnAndroid.
- Switches MimeUtil to use base::NoDestructor for MimeUtilInternal,
required adding const to a few more methods in MimeUtilInternal.

BUG=980091, 980682
TEST=passes locally now.
R=chcunningham

Change-Id: Ib59dce569a5198754e8f5a0df7ee28241f76a5fc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1694241
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Auto-Submit: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#677034}