Fix lock behavior on RTCAudioSession.

webrtc/test/run_all_unittests.cc

 /*
  *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
+#include "webrtc/base/scoped_autorelease_pool.h"
 #include "webrtc/test/test_suite.h"
 
 int main(int argc, char** argv) {
+#if defined(WEBRTC_MAC)
+  rtc::ScopedAutoreleasePool pool;
+#endif
   webrtc::test::TestSuite test_suite(argc, argv);
   return test_suite.Run();
 }