Broker out PPAPI handle duplication

ppapi/proxy/ppapi_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 header, no traditional include guard.
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/file_path.h"
@@ skipping 191 matching lines @@
   IPC_STRUCT_TRAITS_MEMBER(mtu)
 IPC_STRUCT_TRAITS_END()
 #endif  // !defined(OS_NACL)
 
 // These are from the browser to the plugin.
 // Loads the given plugin.
 IPC_MESSAGE_CONTROL1(PpapiMsg_LoadPlugin, FilePath /* path */)
 
 // Creates a channel to talk to a renderer. The plugin will respond with
 // PpapiHostMsg_ChannelCreated.
-IPC_MESSAGE_CONTROL3(PpapiMsg_CreateChannel,
-                     base::ProcessHandle /* host_process_handle */,
+IPC_MESSAGE_CONTROL2(PpapiMsg_CreateChannel,
                      int /* renderer_id */,
                      bool /* incognito */)
 
 // Each plugin may be referenced by multiple renderers. We need the instance
 // IDs to be unique within a plugin, despite coming from different renderers,
 // and unique within a renderer, despite going to different plugins. This means
 // that neither the renderer nor the plugin can generate instance IDs without
 // consulting the other.
 //
 // We resolve this by having the renderer generate a unique instance ID inside
@@ skipping 1103 matching lines @@
 // PPB_X509Certificate_Private
 IPC_SYNC_MESSAGE_CONTROL1_2(PpapiHostMsg_PPBX509Certificate_ParseDER,
                             std::vector<char> /* der */,
                             bool /* succeeded */,
                             ppapi::PPB_X509Certificate_Fields /* result */)
 
 // PPB_Font.
 IPC_SYNC_MESSAGE_CONTROL0_1(PpapiHostMsg_PPBFont_GetFontFamilies,
                             std::string /* result */)
 #endif  // !defined(OS_NACL)