Fix Chromium clang plugin warnings

webrtc/modules/audio_processing/echo_control_mobile_impl.h

 /*
  *  Copyright (c) 2012 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.
  */
 
@@ skipping 11 matching lines @@
 
 namespace webrtc {
 
 class AudioBuffer;
 
 class EchoControlMobileImpl : public EchoControlMobile {
  public:
   EchoControlMobileImpl(rtc::CriticalSection* crit_render,
                         rtc::CriticalSection* crit_capture);
 
-  virtual ~EchoControlMobileImpl();
+  ~EchoControlMobileImpl() override;
 
   int ProcessRenderAudio(const AudioBuffer* audio);
   int ProcessCaptureAudio(AudioBuffer* audio, int stream_delay_ms);
 
   // EchoControlMobile implementation.
   bool is_enabled() const override;
   RoutingMode routing_mode() const override;
   bool is_comfort_noise_enabled() const override;
 
   void Initialize(int sample_rate_hz,
@@ skipping 46 matching lines @@
       render_signal_queue_;
 
   std::vector<std::unique_ptr<Canceller>> cancellers_;
   std::unique_ptr<StreamProperties> stream_properties_;
 
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(EchoControlMobileImpl);
 };
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_ECHO_CONTROL_MOBILE_IMPL_H_