Refactor Pickle Read methods to use higher performance PickleIterator.

chrome/common/render_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 "chrome/common/render_messages.h"
 
 namespace IPC {
 
 void ParamTraits<ContentSettingsPattern>::Write(
     Message* m, const ContentSettingsPattern& pattern) {
   pattern.WriteToMessage(m);
 }
 
 bool ParamTraits<ContentSettingsPattern>::Read(
-    const Message* m, void** iter, ContentSettingsPattern* pattern) {
+    const Message* m, PickleIterator* iter, ContentSettingsPattern* pattern) {
   return pattern->ReadFromMessage(m, iter);
 }
 
 void ParamTraits<ContentSettingsPattern>::Log(
     const ContentSettingsPattern& p, std::string* l) {
   l->append("<ContentSettingsPattern: ");
   l->append(p.ToString());
   l->append(">");
 }
 
 }  // namespace IPC