Check CDM API version compatibility before registering component.

Compatibility is not checked before installing a component. This should be prevented on the server side.

BUG=311374
TEST=video.canPlayType('video/webm; codecs="vp8"', 'com.widevine.alpha'); is affirmative when manifest contains supported "x-cdm-*-versions" values and "" when any value is unsupported.

Review URL: https://codereview.chromium.org/47513020

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232424 0039d316-1c4b-4281-b951-d872f2087c98
Mark memory_watcher as chromium_code.

This marks memory_watcher as chromium_code and fixes issues resulting from that.

R=scottmg@chromium.org

Review URL: https://codereview.chromium.org/55833004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232425 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232425