Refactor Pickle Read methods to use higher performance PickleIterator.

chrome/common/automation_messages.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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, no traditional include guard.
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "chrome/common/automation_constants.h"
@@ skipping 173 matching lines @@
   std::vector<Item> items;
 };
 
 namespace IPC {
 
 // Traits for ContextMenuModel structure to pack/unpack.
 template <>
 struct ParamTraits<ContextMenuModel> {
   typedef ContextMenuModel param_type;
   static void Write(Message* m, const param_type& p);
-  static bool Read(const Message* m, void** iter, param_type* p);
+  static bool Read(const Message* m, PickleIterator* iter, param_type* p);
   static void Log(const param_type& p, std::string* l);
 };
 
 }  // namespace IPC
 
 #endif  // CHROME_COMMON_AUTOMATION_MESSAGES_H_
 
 // Keep this internal message file unchanged to preserve line numbering
 // (and hence the dubious __LINE__-based message numberings) across versions.
 #include "chrome/common/automation_messages_internal.h"