Convert USE_PROPRIETARY_CODECS to a buildflag header.

Convert USE_PROPRIETARY_CODECS to a buildflag header.

Convert the preprocessor define to a buildflag
//header defined in //media. The build arg is kept in //build/config/features.gni due to a dependency on WebRTC (described in a comment).

Reland of https://codereview.chromium.org/2572883002 with no changes. I believe the cause of the previous revert was a now-fixed GN race condition.

TBR=xhwang@chromium.org

Review-Url: https://codereview.chromium.org/2643333002
Cr-Commit-Position: refs/heads/master@{#445226}
Committed: https://chromium.googlesource.com/chromium/src/+/68c7753dd291fbf573dc67c258284440f5aad6ff

[brettw, 2017-01-20 20:58:03]

The CQ bit was checked by brettw@chromium.org

[commit-bot: I haz the power, 2017-01-20 20:58:31]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-01-21 00:28:11]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1484945883876270, "parent_rev":
"af202730923e6c2d878e2fe9fd5b5a4c4bfd6a80", "commit_rev":
"68c7753dd291fbf573dc67c258284440f5aad6ff"}

[commit-bot: I haz the power, 2017-01-21 00:28:49]

Description was changed from

==========
Convert USE_PROPRIETARY_CODECS to a buildflag header.

Convert the preprocessor define to a buildflag
//header defined in //media. The build arg is kept in
//build/config/features.gni due to a dependency on WebRTC (described in a
comment).

Reland of https://codereview.chromium.org/2572883002 with no changes. I believe
the cause of the previous revert was a now-fixed GN race condition.

TBR=xhwang@chromium.org
==========

to

==========
Convert USE_PROPRIETARY_CODECS to a buildflag header.

Convert the preprocessor define to a buildflag
//header defined in //media. The build arg is kept in
//build/config/features.gni due to a dependency on WebRTC (described in a
comment).

Reland of https://codereview.chromium.org/2572883002 with no changes. I believe
the cause of the previous revert was a now-fixed GN race condition.

TBR=xhwang@chromium.org

Review-Url: https://codereview.chromium.org/2643333002
Cr-Commit-Position: refs/heads/master@{#445226}
Committed:
https://chromium.googlesource.com/chromium/src/+/68c7753dd291fbf573dc67c25828...
==========

[commit-bot: I haz the power, 2017-01-21 00:28:51]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/68c7753dd291fbf573dc67c25828...