Fix memory leaks related to PulseAudioInputStream.

media/audio/pulse/pulse_input.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/audio/pulse/pulse_input.h"
 
 #include <pulse/pulseaudio.h>
 
 #include "base/logging.h"
 #include "media/audio/pulse/audio_manager_pulse.h"
@@ skipping 101 matching lines @@
   callback_ = NULL;
 }
 
 void PulseAudioInputStream::Close() {
   DCHECK(thread_checker_.CalledOnValidThread());
   {
     AutoPulseLock auto_lock(pa_mainloop_);
     if (handle_) {
       // Disable all the callbacks before disconnecting.
       pa_stream_set_state_callback(handle_, NULL, NULL);
-      pa_stream_flush(handle_, NULL, NULL);
+      pa_operation* operation = pa_stream_flush(
+          handle_, &pulse::StreamSuccessCallback, pa_mainloop_);
+      WaitForOperationCompletion(pa_mainloop_, operation);
 
       if (pa_stream_get_state(handle_) != PA_STREAM_UNCONNECTED)
         pa_stream_disconnect(handle_);
 
       // Release PulseAudio structures.
       pa_stream_unref(handle_);
       handle_ = NULL;
     }
   }
 
@@ skipping 151 matching lines @@
     // Sleep 5ms to wait until render consumes the data in order to avoid
     // back to back OnData() method.
     if (fifo_.available_blocks())
       base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(5));
   }
 
   pa_threaded_mainloop_signal(pa_mainloop_, 0);
 }
 
 }  // namespace media