Fixed Close() method of TestAudioInputController (callback on caller thread).
Fixed Close() method of TestAudioInputController (callback on caller thread).

It has been changed to make this test class work coherently with the mocked AudioInputController, according to the modifications made in CL 9858007 (which issue the callback from the caller thread, not from the audio thread anymore).

BUG=120110, 120111
TEST=Run content_unittests.

Review URL: https://chromiumcodereview.appspot.com/9864031

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@129623 0039d316-1c4b-4281-b951-d872f2087c98

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