This changes the base clipboard class.

chrome/common/render_messages_internal.h

 // Copyright (c) 2006-2008 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.
 
 // This header is meant to be included in multiple passes, hence no traditional
 // header guard.
 // See ipc_message_macros.h for explanation of the macros and passes.
 
 #include <string>
 #include <vector>
@@ skipping 824 matching lines @@
 
   // This message is used when the object list does not contain a bitmap.
   IPC_MESSAGE_CONTROL1(ViewHostMsg_ClipboardWriteObjectsAsync,
       Clipboard::ObjectMap /* objects */)
   // This message is used when the object list contains a bitmap.
   // It is synchronized so that the renderer knows when it is safe to
   // free the shared memory used to transfer the bitmap.
   IPC_SYNC_MESSAGE_CONTROL1_0(ViewHostMsg_ClipboardWriteObjectsSync,
       Clipboard::ObjectMap /* objects */)
   IPC_SYNC_MESSAGE_CONTROL1_1(ViewHostMsg_ClipboardIsFormatAvailable,
-                              int /* format */,
+                              std::string /* format */,
                               bool /* result */)
   IPC_SYNC_MESSAGE_CONTROL0_1(ViewHostMsg_ClipboardReadText,
                               string16 /* result */)
   IPC_SYNC_MESSAGE_CONTROL0_1(ViewHostMsg_ClipboardReadAsciiText,
                               std::string /* result */)
   IPC_SYNC_MESSAGE_CONTROL0_2(ViewHostMsg_ClipboardReadHTML,
                               string16 /* markup */,
                               GURL /* url */)
 
 #if defined(OS_WIN)
@@ skipping 352 matching lines @@
   IPC_SYNC_MESSAGE_CONTROL1_1(ViewHostMsg_CreateDedicatedWorker,
                               GURL /* url */,
                               int /* route_id */)
 
   // Wraps an IPC message that's destined to the worker on the renderer->browser
   // hop.
   IPC_MESSAGE_CONTROL1(ViewHostMsg_ForwardToWorker,
                        IPC::Message /* message */)
 
 IPC_END_MESSAGES(ViewHost)