[remoting] Replace MessageLoopProxy usage with ThreadTaskRunnerHandle

remoting/protocol/clipboard_thread_proxy.h

 // Copyright (c) 2012 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.
 
 // ClipboardThreadProxy is used to allow a Clipboard on the UI thread to invoke
 // a ClipboardStub on the network thread.
 
 #ifndef REMOTING_PROTOCOL_CLIPBOARD_THREAD_PROXY_H_
 #define REMOTING_PROTOCOL_CLIPBOARD_THREAD_PROXY_H_
 
 #include "base/memory/weak_ptr.h"
 #include "base/task_runner.h"
 #include "remoting/protocol/clipboard_stub.h"
 
-namespace base {
-class MessageLoopProxy;
-}  // namespace base
-
 namespace remoting {
 namespace protocol {
 
 class ClipboardThreadProxy : public ClipboardStub {
  public:
   ~ClipboardThreadProxy() override;
 
   // Constructs a proxy for |clipboard_stub| which will trampoline invocations
   // to |clipboard_stub_task_runner|.
   ClipboardThreadProxy(
@@ skipping 13 matching lines @@
   base::WeakPtr<ClipboardStub> clipboard_stub_;
   scoped_refptr<base::TaskRunner> clipboard_stub_task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(ClipboardThreadProxy);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_CLIPBOARD_THREAD_PROXY_H_