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There is a racing between SyncSocket::Receive in audio_thread_ and SyncSocket::Close in renderer thread.
This patch fixes it by using a waitable event to signal the audio thread that it should stop.

Test=content_unittests by running Valgrind
BUG=103711

Review URL: http://codereview.chromium.org/8659040

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@113386 0039d316-1c4b-4281-b951-d872f2087c98