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

chrome/browser/history/top_sites_cache.cc

Index: chrome/browser/history/top_sites_cache.cc
diff --git a/chrome/browser/history/top_sites_cache.cc b/chrome/browser/history/top_sites_cache.cc
index 5312c0a92c26af769ea83fc587008ebbc770bf0c..10ae296995dc088d840f9053296c145393829dd3 100644
--- a/chrome/browser/history/top_sites_cache.cc
+++ b/chrome/browser/history/top_sites_cache.cc
@@ -24,14 +24,6 @@ void TopSitesCache::SetThumbnails(const URLToImagesMap& images) {
   images_ = images;
 }
 
-void TopSitesCache::SetPageThumbnail(const GURL& url,
-                                     RefCountedBytes* thumbnail,
-                                     const ThumbnailScore& score) {
-  Images& img = images_[GetCanonicalURL(url)];
-  img.thumbnail = thumbnail;
-  img.thumbnail_score = score;
-}
-
 Images* TopSitesCache::GetImage(const GURL& url) {
   return &images_[GetCanonicalURL(url)];
 }
@@ -75,19 +67,6 @@ size_t TopSitesCache::GetURLIndex(const GURL& url) {
   return GetCanonicalURLsIterator(url)->second;
 }
 
-void TopSitesCache::RemoveUnreferencedThumbnails() {
-  for (URLToImagesMap::iterator i = images_.begin(); i != images_.end(); ) {
-    if (IsKnownURL(i->first)) {
-      ++i;
-    } else {
-      URLToImagesMap::iterator next_i = i;
-      ++next_i;
-      images_.erase(i);
-      i = next_i;
-    }
-  }
-}
-
 void TopSitesCache::GenerateCanonicalURLs() {
   canonical_urls_.clear();
   for (size_t i = 0; i < top_sites_.size(); i++)