Fix chromium-style warnings in webrtc/sound/.

webrtc/sound/soundsystemproxy.h

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #ifndef WEBRTC_SOUND_SOUNDSYSTEMPROXY_H_
 #define WEBRTC_SOUND_SOUNDSYSTEMPROXY_H_
 
 #include "webrtc/sound/soundsysteminterface.h"
 #include "webrtc/base/basictypes.h"  // for NULL
 
 namespace rtc {
 
 // A SoundSystemProxy is a sound system that defers to another one.
 // Init(), Terminate(), and GetName() are left as pure virtual, so a sub-class
 // must define them.
 class SoundSystemProxy : public SoundSystemInterface {
  public:
   SoundSystemProxy() : wrapped_(NULL) {}
 
   // Each of these methods simply defers to wrapped_ if non-NULL, else fails.
 
-  virtual bool EnumeratePlaybackDevices(SoundDeviceLocatorList *devices);
-  virtual bool EnumerateCaptureDevices(SoundDeviceLocatorList *devices);
+  bool EnumeratePlaybackDevices(SoundDeviceLocatorList *devices) override;
+  bool EnumerateCaptureDevices(SoundDeviceLocatorList *devices) override;
 
-  virtual bool GetDefaultPlaybackDevice(SoundDeviceLocator **device);
-  virtual bool GetDefaultCaptureDevice(SoundDeviceLocator **device);
+  bool GetDefaultPlaybackDevice(SoundDeviceLocator **device) override;
+  bool GetDefaultCaptureDevice(SoundDeviceLocator **device) override;
 
-  virtual SoundOutputStreamInterface *OpenPlaybackDevice(
+  SoundOutputStreamInterface *OpenPlaybackDevice(
       const SoundDeviceLocator *device,
-      const OpenParams &params);
-  virtual SoundInputStreamInterface *OpenCaptureDevice(
+      const OpenParams &params) override;
+  SoundInputStreamInterface *OpenCaptureDevice(
       const SoundDeviceLocator *device,
-      const OpenParams &params);
+      const OpenParams &params) override;
 
  protected:
   SoundSystemInterface *wrapped_;
 };
 
 }  // namespace rtc
 
 #endif  // WEBRTC_SOUND_SOUNDSYSTEMPROXY_H_