<webview>: Allocate the view instance ID from the WebView shim

content/common/browser_plugin/browser_plugin_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 "base/basictypes.h"
 #include "base/memory/shared_memory.h"
@@ skipping 46 matching lines @@
   IPC_STRUCT_MEMBER(gfx::Rect, view_rect)
   // Indicates the scale factor of the embedder WebView.
   IPC_STRUCT_MEMBER(float, scale_factor)
   // Indicates a request for a full repaint of the page.
   // This is required for switching from compositing to the software
   // rendering path.
   IPC_STRUCT_MEMBER(bool, repaint)
 IPC_STRUCT_END()
 
 IPC_STRUCT_BEGIN(BrowserPluginHostMsg_Attach_Params)
-  IPC_STRUCT_MEMBER(int, browser_plugin_instance_id)
   IPC_STRUCT_MEMBER(std::string, storage_partition_id)
   IPC_STRUCT_MEMBER(bool, persist_storage)
   IPC_STRUCT_MEMBER(bool, focused)
   IPC_STRUCT_MEMBER(bool, visible)
   IPC_STRUCT_MEMBER(std::string, name)
   IPC_STRUCT_MEMBER(std::string, src)
   IPC_STRUCT_MEMBER(BrowserPluginHostMsg_AutoSize_Params, auto_size_params)
   IPC_STRUCT_MEMBER(BrowserPluginHostMsg_ResizeGuest_Params,
                     resize_guest_params)
 IPC_STRUCT_END()
@@ skipping 292 matching lines @@
                      int /* instance_id */,
                      BrowserPluginPermissionType /* permission_type */,
                      int /* request_id */,
                      base::DictionaryValue /* request_info */)
 
 // Forwards a PointerLock Unlock request to the BrowserPlugin.
 IPC_MESSAGE_CONTROL2(BrowserPluginMsg_SetMouseLock,
                      int /* instance_id */,
                      bool /* enable */)