RefCounted types should not have public destructors, chrome/browser/ part 1

chrome/browser/history/history_types.h

Index: chrome/browser/history/history_types.h
diff --git a/chrome/browser/history/history_types.h b/chrome/browser/history/history_types.h
index 30ded6694559fe91dea155180284e4a881543ff9..a070e2f83bc4c57e43a81ce9af1cf90fe7b751c4 100644
--- a/chrome/browser/history/history_types.h
+++ b/chrome/browser/history/history_types.h
@@ -669,13 +669,13 @@ class MostVisitedThumbnails
     : public base::RefCountedThreadSafe<MostVisitedThumbnails> {
  public:
   MostVisitedThumbnails();
-  virtual ~MostVisitedThumbnails();
 
   MostVisitedURLList most_visited;
   URLToImagesMap url_to_images_map;
 
  private:
   friend class base::RefCountedThreadSafe<MostVisitedThumbnails>;
+  virtual ~MostVisitedThumbnails();
 
   DISALLOW_COPY_AND_ASSIGN(MostVisitedThumbnails);
 };