Most Visited: remove over-eager optimization that causes a lot of blank thumbnails

chrome/browser/history/top_sites_cache.h

Index: chrome/browser/history/top_sites_cache.h
diff --git a/chrome/browser/history/top_sites_cache.h b/chrome/browser/history/top_sites_cache.h
index a7cf8a7652dbb0506df4698a6205c59e5b954ec2..08b3d3591fdc886feabf5a10bd410140adb3c039 100644
--- a/chrome/browser/history/top_sites_cache.h
+++ b/chrome/browser/history/top_sites_cache.h
@@ -31,11 +31,6 @@ class TopSitesCache {
   void SetThumbnails(const URLToImagesMap& images);
   const URLToImagesMap& images() const { return images_; }
 
-  // Set a thumbnail.
-  void SetPageThumbnail(const GURL& url,
-                        RefCountedBytes* thumbnail,
-                        const ThumbnailScore& score);
-
   // Returns the thumbnail as an Image for the specified url. This adds an entry
   // for |url| if one has not yet been added.
   Images* GetImage(const GURL& url);
@@ -59,9 +54,6 @@ class TopSitesCache {
   // Returns the index into |top_sites_| for |url|.
   size_t GetURLIndex(const GURL& url);
 
-  // Removes any thumbnails that are no longer referenced by the top sites.
-  void RemoveUnreferencedThumbnails();
-
  private:
   // The entries in CanonicalURLs, see CanonicalURLs for details. The second
   // argument gives the index of the URL into MostVisitedURLs redirects.