TopSites: various small cleanups

components/history/core/browser/top_sites.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 COMPONENTS_HISTORY_CORE_BROWSER_TOP_SITES_H_
 #define COMPONENTS_HISTORY_CORE_BROWSER_TOP_SITES_H_
 
 #include <vector>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "components/history/core/browser/history_types.h"
 #include "components/history/core/browser/top_sites_observer.h"
 #include "components/history/core/common/thumbnail_score.h"
 #include "components/keyed_service/core/refcounted_keyed_service.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/image/image.h"
 
 class GURL;
 
 namespace base {
 class RefCountedMemory;
 }
 
 namespace history {
 
-class TopSitesObserver;
-
 // PrepopulatedPage stores information for prepopulated page for the
 // initial run.
 struct PrepopulatedPage {
   PrepopulatedPage();
   PrepopulatedPage(const GURL& url,
                    const base::string16& title,
                    int favicon_id,
                    int thumbnail_id,
                    SkColor color);
 
@@ skipping 95 matching lines @@
   // false if TopSites isn't loaded yet.
   virtual bool IsForcedFull() = 0;
 
   virtual bool loaded() const = 0;
 
   // Returns the set of prepopulate pages.
   virtual PrepopulatedPageList GetPrepopulatedPages() = 0;
 
   // Adds or updates a |url| for which we should force the capture of a
   // thumbnail next time it's visited. If there is already a non-forced URL
-  // matching this |url| this call has no effect. Indicate this URL was laste
+  // matching this |url| this call has no effect. Indicate this URL was last
   // forced at |time| so we can evict the older URLs when needed. Should be
   // called from the UI thread.
   virtual bool AddForcedURL(const GURL& url, const base::Time& time) = 0;
 
   // Called when user has navigated to |url|.
   virtual void OnNavigationCommitted(const GURL& url) = 0;
 
   // Add Observer to the list.
   void AddObserver(TopSitesObserver* observer);
 
   // Remove Observer from the list.
   void RemoveObserver(TopSitesObserver* observer);
 
  protected:
   void NotifyTopSitesLoaded();
   void NotifyTopSitesChanged(const TopSitesObserver::ChangeReason reason);
   ~TopSites() override;
 
  private:
   friend class base::RefCountedThreadSafe<TopSites>;
 
   base::ObserverList<TopSitesObserver, true> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(TopSites);
 };
 
 }  // namespace history
 
 #endif  // COMPONENTS_HISTORY_CORE_BROWSER_TOP_SITES_H_