ui: Cleanup class/struct forward declarations

content/common/clipboard_messages.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.
 
 // Multiply-included message file, so no include guard.
 
 #include <stdint.h>
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "build/build_config.h"
 #include "base/memory/shared_memory.h"
 #include "base/strings/string16.h"
 #include "build/build_config.h"
 #include "content/common/clipboard_format.h"
 #include "content/common/content_export.h"
 #include "ipc/ipc_message_macros.h"
 #include "ipc/param_traits_macros.h"
 #include "ui/base/clipboard/clipboard.h"
+#include "ui/gfx/geometry/size.h"
 #include "url/ipc/url_param_traits.h"
 
 // Singly-included section for types and/or struct declarations.
 #ifndef CONTENT_COMMON_CLIPBOARD_MESSAGES_H_
 #define CONTENT_COMMON_CLIPBOARD_MESSAGES_H_
 
 // Custom data consists of arbitrary MIME types an untrusted sender wants to
 // write to the clipboard. Note that exposing a general interface to do this is
 // dangerous--an untrusted sender could cause a DoS or code execution.
 typedef std::map<base::string16, base::string16> CustomDataMap;
@@ skipping 72 matching lines @@
 IPC_SYNC_MESSAGE_CONTROL3_0(ClipboardHostMsg_WriteImage,
                             ui::ClipboardType /* type */,
                             gfx::Size /* size */,
                             base::SharedMemoryHandle /* bitmap handle */)
 IPC_MESSAGE_CONTROL1(ClipboardHostMsg_CommitWrite, ui::ClipboardType /* type */)
 
 #if defined(OS_MACOSX)
 IPC_MESSAGE_CONTROL1(ClipboardHostMsg_FindPboardWriteStringAsync,
                      base::string16 /* text */)
 #endif