Enable -Winconsistent-missing-override flag.

webrtc/p2p/base/port_unittest.cc

 /*
  *  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.
  */
 
@@ skipping 947 matching lines @@
 
   void set_next_udp_socket(AsyncPacketSocket* next_udp_socket) {
     next_udp_socket_ = next_udp_socket;
   }
   void set_next_server_tcp_socket(AsyncPacketSocket* next_server_tcp_socket) {
     next_server_tcp_socket_ = next_server_tcp_socket;
   }
   void set_next_client_tcp_socket(AsyncPacketSocket* next_client_tcp_socket) {
     next_client_tcp_socket_ = next_client_tcp_socket;
   }
-  rtc::AsyncResolverInterface* CreateAsyncResolver() {
+  rtc::AsyncResolverInterface* CreateAsyncResolver() override {
     return NULL;
   }
 
  private:
   AsyncPacketSocket* next_udp_socket_;
   AsyncPacketSocket* next_server_tcp_socket_;
   AsyncPacketSocket* next_client_tcp_socket_;
 };
 
 class FakeAsyncPacketSocket : public AsyncPacketSocket {
@@ skipping 1600 matching lines @@
   std::unique_ptr<Port> tcp_port(CreateTcpPort(kLocalAddr1));
   EXPECT_TRUE(tcp_port->SupportsProtocol(TCP_PROTOCOL_NAME));
   EXPECT_TRUE(tcp_port->SupportsProtocol(SSLTCP_PROTOCOL_NAME));
   EXPECT_FALSE(tcp_port->SupportsProtocol(UDP_PROTOCOL_NAME));
 
   std::unique_ptr<Port> turn_port(
       CreateTurnPort(kLocalAddr1, nat_socket_factory1(), PROTO_UDP, PROTO_UDP));
   EXPECT_TRUE(turn_port->SupportsProtocol(UDP_PROTOCOL_NAME));
   EXPECT_FALSE(turn_port->SupportsProtocol(TCP_PROTOCOL_NAME));
 }