Changed AudioCapturer::Start() to return bool.

BUG=138076


Review URL: https://chromiumcodereview.appspot.com/10790102

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@147688 0039d316-1c4b-4281-b951-d872f2087c98
3 files changed