Refactor Pickle Read methods to use higher performance PickleIterator.

content/common/clipboard_messages.cc

-// 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.
 
 #include "content/common/clipboard_messages.h"
 
 #include "ui/base/clipboard/clipboard.h"
 
 namespace IPC {
 
 void ParamTraits<ui::Clipboard::FormatType>::Write(
     Message* m, const param_type& p) {
   m->WriteString(p.Serialize());
 }
 
 bool ParamTraits<ui::Clipboard::FormatType>::Read(
-    const Message* m, void** iter, param_type* r) {
+    const Message* m, PickleIterator* iter, param_type* r) {
   std::string serialization;
   if (!ReadParam(m, iter, &serialization))
     return false;
   *r = ui::Clipboard::FormatType::Deserialize(serialization);
   return true;
 }
 
 void ParamTraits<ui::Clipboard::FormatType>::Log(
     const param_type& p, std::string* l) {
   *l = p.Serialize();
 }
 
 }  // namespace IPC