Refactor Pickle Read methods to use higher performance PickleIterator.

content/renderer/render_widget.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 "content/renderer/render_widget.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
@@ skipping 470 matching lines @@
     TRACE_EVENT0("renderer", "EarlyOut_AcceleratedCompositingOff");
     return;
   }
 
   // Continue painting if necessary...
   DoDeferredUpdateAndSendInputAck();
 }
 
 void RenderWidget::OnHandleInputEvent(const IPC::Message& message) {
   TRACE_EVENT0("renderer", "RenderWidget::OnHandleInputEvent");
-  void* iter = NULL;
+  PickleReader iter(message);
 
   const char* data;
   int data_length;
   handling_input_event_ = true;
   if (!message.ReadData(&iter, &data, &data_length)) {
     handling_input_event_ = false;
     return;
   }
 
   const WebInputEvent* input_event =
@@ skipping 1153 matching lines @@
   }
 }
 
 bool RenderWidget::WillHandleMouseEvent(const WebKit::WebMouseEvent& event) {
   return false;
 }
 
 bool RenderWidget::WebWidgetHandlesCompositorScheduling() const {
   return false;
 }