Add a content switch to turn off unprefixed MediaSource API

Add a content switch to turn off unprefixed MediaSource API

this is for ICS devices

blink CL: https://codereview.chromium.org/26028003/

BUG=304112
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=227577

[qinmin, 2013-10-04 19:37:01]

PTAL

[acolwell GONE FROM CHROMIUM, 2013-10-04 19:52:26]

LGTM

[qinmin, 2013-10-04 20:14:31]

+creis@ for content/ OWNER

[Charlie Reis, 2013-10-04 20:35:49]

Rubber stamp LGTM.

[commit-bot: I haz the power, 2013-10-05 16:50:48]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/[email protected]/26015004/1

[commit-bot: I haz the power, 2013-10-05 17:15:20]

Sorry for I got bad news for ya.
Compile failed with a clobber build on linux_rel.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_rel&...
Your code is likely broken or HEAD is junk. Please ensure your
code is not broken then alert the build sheriffs.
Look at the try server FAQ for more details.

[commit-bot: I haz the power, 2013-10-07 14:36:25]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/[email protected]/26015004/1

[commit-bot: I haz the power, 2013-10-07 14:50:09]

Sorry for I got bad news for ya.
Compile failed with a clobber build on android_clang_dbg.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=android_cl...
Your code is likely broken or HEAD is junk. Please ensure your
code is not broken then alert the build sheriffs.
Look at the try server FAQ for more details.

[commit-bot: I haz the power, 2013-10-07 19:46:09]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/[email protected]/26015004/1

[commit-bot: I haz the power, 2013-10-07 20:01:24]

Sorry for I got bad news for ya.
Compile failed with a clobber build on android_dbg.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=android_db...
Your code is likely broken or HEAD is junk. Please ensure your
code is not broken then alert the build sheriffs.
Look at the try server FAQ for more details.

[commit-bot: I haz the power, 2013-10-08 16:09:39]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/[email protected]/26015004/1

[commit-bot: I haz the power, 2013-10-08 20:34:06]

Change committed as 227577