Replace VideoStream::SizeCallback with VideoStream::Observer interface.

remoting/protocol/fake_connection_to_client.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef REMOTING_PROTOCOL_FAKE_CONNECTION_TO_CLIENT_H_
 #define REMOTING_PROTOCOL_FAKE_CONNECTION_TO_CLIENT_H_
 
 #include <stdint.h>
 
 #include "base/callback.h"
@@ skipping 12 matching lines @@
 class FakeVideoStream : public protocol::VideoStream {
  public:
   FakeVideoStream();
   ~FakeVideoStream() override;
 
   // protocol::VideoStream interface.
   void Pause(bool pause) override;
   void OnInputEventReceived(int64_t event_timestamp) override;
   void SetLosslessEncode(bool want_lossless) override;
   void SetLosslessColor(bool want_lossless) override;
-  void SetSizeCallback(const SizeCallback& size_callback) override;
+  void SetObserver(Observer* observer) override;
 
-  const SizeCallback& size_callback() { return size_callback_; }
+  Observer* observer() { return observer_; }
 
   base::WeakPtr<FakeVideoStream> GetWeakPtr();
 
  private:
-  SizeCallback size_callback_;
+  Observer* observer_ = nullptr;
 
   base::WeakPtrFactory<FakeVideoStream> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeVideoStream);
 };
 
 class FakeConnectionToClient : public ConnectionToClient {
  public:
   FakeConnectionToClient(std::unique_ptr<Session> session);
   ~FakeConnectionToClient() override;
@@ skipping 56 matching lines @@
   bool is_connected_ = true;
   ErrorCode disconnect_error_ = OK;
 
   DISALLOW_COPY_AND_ASSIGN(FakeConnectionToClient);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_FAKE_CONNECTION_TO_CLIENT_H_