Remove unused includes in c/b/prerender.

chrome/browser/prerender/prerender_link_manager.h

 // 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.
 
 #ifndef CHROME_BROWSER_PRERENDER_PRERENDER_LINK_MANAGER_H_
 #define CHROME_BROWSER_PRERENDER_PRERENDER_LINK_MANAGER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <list>
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/time/time.h"
 #include "chrome/browser/prerender/prerender_handle.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "url/gurl.h"
 
-class Profile;
-
 namespace content {
 struct Referrer;
 }
 
 namespace gfx {
 class Size;
 }
 
 FORWARD_DECLARE_TEST(WebViewTest, NoPrerenderer);
 
@@ skipping 138 matching lines @@
   // Helper object to manage prerenders which are launched by other prerenders
   // and must be deferred until the launcher is swapped in.
   std::unique_ptr<PendingPrerenderManager> pending_prerender_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(PrerenderLinkManager);
 };
 
 }  // namespace prerender
 
 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_LINK_MANAGER_H_