Replace FilePath with base::FilePath in some more top level directories.

media/audio/mac/audio_device_listener_mac.cc

 // Copyright (c) 2013 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/mac/audio_device_listener_mac.h"
 
 #include "base/bind.h"
 #include "base/file_path.h"
 #include "base/logging.h"
 #include "base/mac/libdispatch_task_runner.h"
@@ skipping 197 matching lines @@
       kAudioObjectSystemObject, &kDeviceChangePropertyAddress,
       &AudioDeviceListenerMac::OnDefaultDeviceChanged, this);
   OSSTATUS_DLOG_IF(ERROR, result != noErr, result)
       << "AudioObjectRemovePropertyListener() failed!";
 }
 
 bool AudioDeviceListenerMac::LoadAudioObjectPropertyListenerBlockFunctions() {
   // Dynamically load required block functions.
   // TODO(dalecurtis): Remove once the deployment target is > 10.6.
   std::string error;
-  base::NativeLibrary core_audio = base::LoadNativeLibrary(FilePath(
+  base::NativeLibrary core_audio = base::LoadNativeLibrary(base::FilePath(
       "/System/Library/Frameworks/CoreAudio.framework/Versions/Current/"
       "CoreAudio"), &error);
   if (!error.empty()) {
     LOG(ERROR) << "Could not open CoreAudio library: " << error;
     return false;
   }
 
   core_audio_lib_.Reset(core_audio);
   add_listener_block_func_ =
       reinterpret_cast<AudioObjectPropertyListenerBlockT>(
           core_audio_lib_.GetFunctionPointer(
               "AudioObjectAddPropertyListenerBlock"));
   remove_listener_block_func_ =
       reinterpret_cast<AudioObjectPropertyListenerBlockT>(
           core_audio_lib_.GetFunctionPointer(
               "AudioObjectRemovePropertyListenerBlock"));
 
   // If either function failed to load, skip listener registration.
   if (!add_listener_block_func_ || !remove_listener_block_func_) {
     DLOG(ERROR) << "Failed to load audio property listener block functions!";
     return false;
   }
 
   return true;
 }
 
 }  // namespace media