Fix crash caused by DCHECK global pointer for --single-process model

content/renderer/media/audio_message_filter.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 "content/renderer/media/audio_message_filter.h"
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/strings/stringprintf.h"
 #include "content/common/media/audio_messages.h"
@@ skipping 31 matching lines @@
   int stream_id_;
 };
 
 AudioMessageFilter* AudioMessageFilter::g_filter = NULL;
 
 AudioMessageFilter::AudioMessageFilter(
     const scoped_refptr<base::MessageLoopProxy>& io_message_loop)
     : sender_(NULL),
       audio_hardware_config_(NULL),
       io_message_loop_(io_message_loop) {
-  DCHECK(!g_filter);
   g_filter = this;
 }
 
 AudioMessageFilter::~AudioMessageFilter() {
   DCHECK_EQ(g_filter, this);
   g_filter = NULL;
 }
 
 // static
 AudioMessageFilter* AudioMessageFilter::Get() {
@@ skipping 173 matching lines @@
   audio_hardware_config_->UpdateOutputConfig(output_params);
 }
 
 void AudioMessageFilter::SetAudioHardwareConfig(
     media::AudioHardwareConfig* config) {
   base::AutoLock auto_lock(lock_);
   audio_hardware_config_ = config;
 }
 
 }  // namespace content