Cleanup: Remove more forward declarations in various chrome/browser directories.

chrome/browser/page_info_model.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_PAGE_INFO_MODEL_H_
 #define CHROME_BROWSER_PAGE_INFO_MODEL_H_
 #pragma once
 
 #include <vector>
 
 #include "base/string16.h"
 #include "chrome/browser/history/history.h"
 #include "content/browser/cancelable_request.h"
 #include "content/browser/tab_contents/navigation_entry.h"
 #include "googleurl/src/gurl.h"
 #include "ui/gfx/image/image.h"
 
 class PageInfoModelObserver;
-class PrefService;
 class Profile;
 
 // The model that provides the information that should be displayed in the page
 // info dialog/bubble.
 class PageInfoModel {
  public:
   enum SectionInfoType {
     SECTION_INFO_IDENTITY = 0,
     SECTION_INFO_CONNECTION,
     SECTION_INFO_FIRST_VISIT,
@@ skipping 78 matching lines @@
   std::vector<gfx::Image*> icons_;
 
   // Used to request number of visits.
   CancelableRequestConsumer request_consumer_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(PageInfoModel);
 };
 
 #endif  // CHROME_BROWSER_PAGE_INFO_MODEL_H_