Topsites become keyedService based.

chrome/browser/history/top_sites.h

Index: chrome/browser/history/top_sites.h
diff --git a/chrome/browser/history/top_sites.h b/chrome/browser/history/top_sites.h
index 3f5260f714d99199fc6d36a351ca1d538c51e888..dabbe07d1f4a0dfb41e1ddff497431732d705c82 100644
--- a/chrome/browser/history/top_sites.h
+++ b/chrome/browser/history/top_sites.h
@@ -8,11 +8,11 @@
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/gtest_prod_util.h"
-#include "base/memory/ref_counted.h"
 #include "chrome/browser/history/history_service.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"
 
@@ -35,9 +35,8 @@ class TopSitesCache;
 //
 // Some methods should only be called from the UI thread (see method
 // descriptions below). All others are assumed to be threadsafe.
-class TopSites
-    : public base::RefCountedThreadSafe<TopSites>,
-      public content::NotificationObserver {
+class TopSites : public RefcountedKeyedService,
+                 public content::NotificationObserver {
  public:
   TopSites();
 
@@ -54,10 +53,9 @@ class TopSites
 
   // While testing the history system, we want to set the thumbnail to a piece
   // of static memory.
-  virtual bool SetPageThumbnailToJPEGBytes(
-      const GURL& url,
-      const base::RefCountedMemory* memory,
-      const ThumbnailScore& score) = 0;
+  virtual bool SetPageThumbnailToJPEGBytes(const GURL& url,
+                                           const base::RefCountedMemory* memory,
+                                           const ThumbnailScore& score) = 0;
 
   typedef base::Callback<void(const MostVisitedURLList&)>
       GetMostVisitedURLsCallback;
@@ -67,9 +65,8 @@ class TopSites
   // invoked on any thread. NOTE: the callback is called immediately if we have
   // the data cached. If data is not available yet, callback will later be
   // posted to the thread called this function.
-  virtual void GetMostVisitedURLs(
-      const GetMostVisitedURLsCallback& callback,
-      bool include_forced_urls) = 0;
+  virtual void GetMostVisitedURLs(const GetMostVisitedURLsCallback& callback,
+                                  bool include_forced_urls) = 0;
 
   // Gets a thumbnail for a given page. Returns true iff we have the thumbnail.
   // This may be invoked on any thread.