Fix a bunch of IWYU violators that don't include scoped_ptr.h

remoting/host/clipboard.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.
 
 #ifndef REMOTING_HOST_CLIPBOARD_H_
 #define REMOTING_HOST_CLIPBOARD_H_
 
 #include <string>
 
 #include "base/callback.h"
+#include "base/memory/scoped_ptr.h"
 
 namespace remoting {
 
 namespace protocol {
 class ClipboardEvent;
 class ClipboardStub;
 }  // namespace protocol
 
 // All Clipboard methods should be run on the UI thread, so that the Clipboard
 // can get change notifications.
 class Clipboard {
  public:
   virtual ~Clipboard() {}
 
   // Initialises any objects needed to read from or write to the clipboard.
   virtual void Start(scoped_ptr<protocol::ClipboardStub> client_clipboard) = 0;
 
   // Writes an item to the clipboard. It must be called after Start().
   virtual void InjectClipboardEvent(const protocol::ClipboardEvent& event) = 0;
 
   static scoped_ptr<Clipboard> Create();
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_CLIPBOARD_H_