Build SpeechRecognitionManagerImpl on iOS. Run content speech unit tests.
Build SpeechRecognitionManagerImpl on iOS:
* Ifdef-out PermissionRequest on iOS as it extends MediaStreamRequester which
is part of content/browser/renderer_host/media/ and is not build on iOS.
* Voice search can only be initiated by clear user action. Add DCHECKs
to clearly identify the expected behavior.
* Build all content/browser/speech/... unit tests.
Review URL: https://chromiumcodereview.appspot.com/
11229004
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@163803 0039d316-1c4b-4281-b951-d872f2087c98