Remove a chrome dependency by removing Prerender from ResourceDispatcherHost.

chrome/browser/prerender/prerender_manager.h

 // Copyright (c) 2011 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.
 
 #ifndef CHROME_BROWSER_PRERENDER_PRERENDER_MANAGER_H_
 #define CHROME_BROWSER_PRERENDER_PRERENDER_MANAGER_H_
 #pragma once
 
 #include <list>
 #include <map>
@@ skipping 30 matching lines @@
 // Adds either a preload or a pending preload to the PrerenderManager.
 // Must be called on the UI thread.
 void HandlePrefetchTag(
     const base::WeakPtr<PrerenderManager>& prerender_manager,
     int render_process_id,
     int render_view_id,
     const GURL& url,
     const GURL& referrer,
     bool make_pending);
 
+void DestroyPreloadForRenderView(
+    const base::WeakPtr<PrerenderManager>& prerender_manager_weak_ptr,
+    int child_id,
+    int route_id,
+    FinalStatus final_status);
+
 // PrerenderManager is responsible for initiating and keeping prerendered
 // views of webpages. All methods must be called on the UI thread unless
 // indicated otherwise.
 class PrerenderManager : public base::SupportsWeakPtr<PrerenderManager>,
                          public base::NonThreadSafe {
  public:
   // PrerenderManagerMode is used in a UMA_HISTOGRAM, so please do not
   // add in the middle.
   enum PrerenderManagerMode {
     PRERENDER_MODE_DISABLED,
@@ skipping 259 matching lines @@
 
   // Cancels pending tasks on deletion.
   ScopedRunnableMethodFactory<PrerenderManager> runnable_method_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PrerenderManager);
 };
 
 }  // namespace prerender
 
 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_MANAGER_H_