Remove the flag for disabling the P2P stun filter.

This flag is no longer needed as cast no longer use p2p sockets.
This is a revert of https://codereview.chromium.org/111833003

Review URL: https://codereview.chromium.org/173113003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253450 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253450
Encrypted Media: Add supportsEncryptedMediaMIMEType().

This is necessary to implement MediaKeys::isTypeSupported().

The Blink side change is at: https://codereview.chromium.org/170783017

BUG=224786
TEST=Tested manually with Blink side change. EncryptedMediaIsTypeSupportedTest
will be updated after this CL and the Blink side CL are landed.

Review URL: https://codereview.chromium.org/173293002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253451 0039d316-1c4b-4281-b951-d872f2087c98
Enable -O2 optimization in command_buffer_service on Android.

BUG=346541

Review URL: https://codereview.chromium.org/178703006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253452 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253452