Refactor Pickle Read methods to use higher performance PickleIterator.

ui/base/dragdrop/gtk_dnd_util.cc

 // 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 "ui/base/dragdrop/gtk_dnd_util.h"
 
 #include <string>
 
 #include "base/logging.h"
 #include "base/pickle.h"
@@ skipping 198 matching lines @@
 bool ExtractNamedURL(GtkSelectionData* selection_data,
                      GURL* url,
                      string16* title) {
   if (!selection_data || gtk_selection_data_get_length(selection_data) <= 0)
     return false;
 
   Pickle data(
       reinterpret_cast<const char*>(
           gtk_selection_data_get_data(selection_data)),
       gtk_selection_data_get_length(selection_data));
-  void* iter = NULL;
+  PickleIterator iter(data);
   std::string title_utf8, url_utf8;
   if (!data.ReadString(&iter, &title_utf8) ||
       !data.ReadString(&iter, &url_utf8)) {
     return false;
   }
 
   GURL gurl(url_utf8);
   if (!gurl.is_valid())
     return false;
 
@@ skipping 36 matching lines @@
   GURL gurl(data.substr(0, newline));
   if (!gurl.is_valid())
     return false;
 
   *url = gurl;
   *title = UTF8ToUTF16(data.substr(newline + 1));
   return true;
 }
 
 }  // namespace ui