Add override declarations to PeerConnectionObserver subclasses, and delete obsolete methods.

webrtc/pc/peerconnectioninterface_unittest.cc

 /*
  *  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 528 matching lines @@
     pc_ = pc;
     if (pc) {
       state_ = pc_->signaling_state();
     }
   }
   void OnSignalingChange(
       PeerConnectionInterface::SignalingState new_state) override {
     EXPECT_EQ(pc_->signaling_state(), new_state);
     state_ = new_state;
   }
-  // TODO(bemasc): Remove this once callers transition to OnIceGatheringChange.
-  virtual void OnStateChange(StateType state_changed) {
-    if (pc_.get() == NULL)
-      return;
-    switch (state_changed) {
-      case kSignalingState:
-        // OnSignalingChange and OnStateChange(kSignalingState) should always
-        // be called approximately simultaneously.  To ease testing, we require
-        // that they always be called in that order.  This check verifies
-        // that OnSignalingChange has just been called.
-        EXPECT_EQ(pc_->signaling_state(), state_);
-        break;
-      case kIceState:
-        ADD_FAILURE();
-        break;
-      default:
-        ADD_FAILURE();
-        break;
-    }
-  }
 
   MediaStreamInterface* RemoteStream(const std::string& label) {
     return remote_streams_->find(label);
   }
   StreamCollectionInterface* remote_streams() const { return remote_streams_; }
   void OnAddStream(rtc::scoped_refptr<MediaStreamInterface> stream) override {
     last_added_stream_ = stream;
     remote_streams_->AddStream(stream);
   }
   void OnRemoveStream(
@@ skipping 2816 matching lines @@
   EXPECT_NE(a, f);
 
   PeerConnectionInterface::RTCConfiguration g;
   g.disable_ipv6 = true;
   EXPECT_NE(a, g);
 
   PeerConnectionInterface::RTCConfiguration h(
       PeerConnectionInterface::RTCConfigurationType::kAggressive);
   EXPECT_NE(a, h);
 }