mac: Delete more 10.5-only code

media/audio/mac/audio_manager_mac.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 <CoreAudio/AudioHardware.h>
 
 #include <string>
 
 #include "base/mac/mac_logging.h"
-#include "base/mac/mac_util.h"
 #include "base/mac/scoped_cftyperef.h"
 #include "base/sys_string_conversions.h"
 #include "media/audio/mac/audio_input_mac.h"
 #include "media/audio/mac/audio_low_latency_input_mac.h"
 #include "media/audio/mac/audio_low_latency_output_mac.h"
 #include "media/audio/mac/audio_manager_mac.h"
 #include "media/audio/mac/audio_output_mac.h"
 #include "media/base/limits.h"
 
 namespace media {
 
 // Maximum number of output streams that can be open simultaneously.
 static const int kMaxOutputStreams = 50;
 
-// By experiment the maximum number of audio streams allowed in Leopard
-// is 18. But we put a slightly smaller number just to be safe.
-static const int kMaxOutputStreamsLeopard = 15;
-
 static bool HasAudioHardware(AudioObjectPropertySelector selector) {
   AudioDeviceID output_device_id = kAudioObjectUnknown;
   const AudioObjectPropertyAddress property_address = {
     selector,
     kAudioObjectPropertyScopeGlobal,            // mScope
     kAudioObjectPropertyElementMaster           // mElement
   };
   size_t output_device_id_size = sizeof(output_device_id);
   OSStatus err = AudioObjectGetPropertyData(kAudioObjectSystemObject,
                                             &property_address,
@@ skipping 166 matching lines @@
 
   if (result) {
     OSSTATUS_DLOG(WARNING, result) << "Unable to query device " << device_id
                                    << " for AudioDeviceID";
   }
 
   return audio_device_id;
 }
 
 AudioManagerMac::AudioManagerMac() {
-  // We are hitting a bug in Leopard where too many audio streams will cause
-  // a deadlock in the AudioQueue API when starting the stream. Unfortunately
-  // there's no way to detect it within the AudioQueue API, so we put a
-  // special hard limit only for Leopard.
-  // See bug: http://crbug.com/30242
-  // In OS other than OSX Leopard, the number of audio streams
-  // allowed is a lot more.
-  int max_output_stream = base::mac::IsOSLeopardOrEarlier() ?
-      kMaxOutputStreamsLeopard : kMaxOutputStreams;
-  SetMaxOutputStreamsAllowed(max_output_stream);
+  SetMaxOutputStreamsAllowed(kMaxOutputStreams);
 }
 
 AudioManagerMac::~AudioManagerMac() {
   Shutdown();
 }
 
 bool AudioManagerMac::HasAudioOutputDevices() {
   return HasAudioHardware(kAudioHardwarePropertyDefaultOutputDevice);
 }
 
@@ skipping 49 matching lines @@
     stream = new AUAudioInputStream(this, params, audio_device_id);
 
   return stream;
 }
 
 AudioManager* CreateAudioManager() {
   return new AudioManagerMac();
 }
 
 }  // namespace media