Refactor Pickle Read methods to use higher performance PickleIterator.

chrome/common/automation_messages.cc

Index: chrome/common/automation_messages.cc
diff --git a/chrome/common/automation_messages.cc b/chrome/common/automation_messages.cc
index 1801fd68c8327f3a4245287117419d7905cd60f9..ef3dd478817bac4e21ea7660c113ad6a59c9b971 100644
--- a/chrome/common/automation_messages.cc
+++ b/chrome/common/automation_messages.cc
@@ -1,4 +1,4 @@
-// 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.
 
@@ -73,7 +73,7 @@ void ParamTraits<ContextMenuModel>::Write(Message* m,
 
 // static
 bool ParamTraits<ContextMenuModel>::Read(const Message* m,
-                                         void** iter,
+                                         PickleIterator* iter,
                                          param_type* p) {
   size_t item_count = 0;
   if (!ReadParam(m, iter, &item_count))