Enable -Winconsistent-missing-override flag.

webrtc/api/peerconnectionfactory.h

 /*
  *  Copyright 2011 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 16 matching lines @@
 class BasicPacketSocketFactory;
 }
 
 namespace webrtc {
 
 typedef rtc::RefCountedObject<DtlsIdentityStoreImpl>
     RefCountedDtlsIdentityStore;
 
 class PeerConnectionFactory : public PeerConnectionFactoryInterface {
  public:
-  virtual void SetOptions(const Options& options) {
+  void SetOptions(const Options& options) override {
     options_ = options;
   }
 
   // Deprecated, use version without constraints.
   rtc::scoped_refptr<PeerConnectionInterface> CreatePeerConnection(
       const PeerConnectionInterface::RTCConfiguration& configuration,
       const MediaConstraintsInterface* constraints,
       rtc::scoped_ptr<cricket::PortAllocator> allocator,
       rtc::scoped_ptr<DtlsIdentityStoreInterface> dtls_identity_store,
       PeerConnectionObserver* observer) override;
@@ skipping 75 matching lines @@
       video_decoder_factory_;
   rtc::scoped_ptr<rtc::BasicNetworkManager> default_network_manager_;
   rtc::scoped_ptr<rtc::BasicPacketSocketFactory> default_socket_factory_;
 
   rtc::scoped_refptr<RefCountedDtlsIdentityStore> dtls_identity_store_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_PEERCONNECTIONFACTORY_H_