Revert of Enable -Winconsistent-missing-override flag.

webrtc/api/webrtcsession.h

 /*
  *  Copyright 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 249 matching lines @@
       rtc::VideoSinkInterface<cricket::VideoFrame>* sink) override;
   void SetVideoSend(uint32_t ssrc,
                     bool enable,
                     const cricket::VideoOptions* options) override;
 
   RtpParameters GetVideoRtpParameters(uint32_t ssrc) const override;
   bool SetVideoRtpParameters(uint32_t ssrc,
                              const RtpParameters& parameters) override;
 
   // Implements DtmfProviderInterface.
-  bool CanInsertDtmf(const std::string& track_id) override;
-  bool InsertDtmf(const std::string& track_id,
-                  int code, int duration) override;
-  sigslot::signal0<>* GetOnDestroyedSignal() override;
+  virtual bool CanInsertDtmf(const std::string& track_id);
+  virtual bool InsertDtmf(const std::string& track_id,
+                          int code, int duration);
+  virtual sigslot::signal0<>* GetOnDestroyedSignal();
 
   // Implements DataChannelProviderInterface.
   bool SendData(const cricket::SendDataParams& params,
                 const rtc::CopyOnWriteBuffer& payload,
                 cricket::SendDataResult* result) override;
   bool ConnectDataChannel(DataChannel* webrtc_data_channel) override;
   void DisconnectDataChannel(DataChannel* webrtc_data_channel) override;
   void AddSctpDataStream(int sid) override;
   void RemoveSctpDataStream(int sid) override;
   bool ReadyToSendData() const override;
@@ skipping 231 matching lines @@
   PeerConnectionInterface::BundlePolicy bundle_policy_;
 
   // Declares the RTCP mux policy for the WebRTCSession.
   PeerConnectionInterface::RtcpMuxPolicy rtcp_mux_policy_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(WebRtcSession);
 };
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_WEBRTCSESSION_H_