Fix typo'd usage of OS_MAC vs OS_MACOSX!

content/renderer/media/render_audiosourceprovider.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/render_audiosourceprovider.h"
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
@@ skipping 16 matching lines @@
       channels_(0),
       sample_rate_(0),
       is_running_(false),
       renderer_(NULL),
       client_(NULL) {
   // We create an AudioRendererSink here, but we don't yet know the audio format
   // (sample-rate, etc.) at this point.  Later, when Initialize() is called, we
   // have the audio format information and call AudioRendererSink::Initialize()
   // to fully initialize it.
   const CommandLine* cmd_line = CommandLine::ForCurrentProcess();
-#if defined(OS_WIN) || defined(OS_MAC)
+#if defined(OS_WIN) || defined(OS_MACOSX)
   const bool use_mixing =
       !cmd_line->HasSwitch(switches::kDisableRendererSideMixing);
 #else
   const bool use_mixing =
       cmd_line->HasSwitch(switches::kEnableRendererSideMixing);
 #endif
 
   if (use_mixing) {
     default_sink_ = RenderThreadImpl::current()->
         GetAudioRendererMixerManager()->CreateInput();
@@ skipping 112 matching lines @@
     // Inform WebKit about the audio stream format.
     client_->setFormat(channels_, sample_rate_);
   }
 
   is_initialized_ = true;
 }
 
 RenderAudioSourceProvider::~RenderAudioSourceProvider() {}
 
 }  // namespace content