Fix memory leak in PrerenderDispatcher.

chrome/renderer/prerender/prerender_dispatcher.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 "chrome/renderer/prerender/prerender_dispatcher.h"
 
 #include "base/logging.h"
 #include "chrome/common/prerender_messages.h"
 #include "chrome/renderer/prerender/prerendering_support.h"
 #include "googleurl/src/gurl.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebPrerenderingSupport.h"
 
 namespace prerender {
 
-PrerenderDispatcher::PrerenderDispatcher() {
-  WebKit::WebPrerenderingSupport::initialize(new PrerenderingSupport());
+PrerenderDispatcher::PrerenderDispatcher()
+    : prerendering_support_(new PrerenderingSupport()) {
+  WebKit::WebPrerenderingSupport::initialize(prerendering_support_.get());
 }
 
 PrerenderDispatcher::~PrerenderDispatcher() {
+  if (prerendering_support_.get())
+    WebKit::WebPrerenderingSupport::shutdown();
 }
 
 bool PrerenderDispatcher::IsPrerenderURL(const GURL& url) const {
   return prerender_urls_.find(url) != prerender_urls_.end();
 }
 
 bool PrerenderDispatcher::OnControlMessageReceived(
     const IPC::Message& message) {
  bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(PrerenderDispatcher, message)
@@ skipping 24 matching lines @@
   // is unlikely to go to the prerendered page.
   if (it == prerender_urls_.end())
     return;
   DCHECK(it->second > 0);
   it->second -= 1;
   if (it->second == 0)
     prerender_urls_.erase(it);
 }
 
 }  // namespace prerender