Add method for removing bookmark image data.

components/enhanced_bookmarks/enhanced_bookmark_model.h

Index: components/enhanced_bookmarks/enhanced_bookmark_model.h
diff --git a/components/enhanced_bookmarks/enhanced_bookmark_model.h b/components/enhanced_bookmarks/enhanced_bookmark_model.h
index 7eab2665b1c881959bf1ddbd3000f563493882ee..166023743cebda3021a06f2f9389a0970b471993 100644
--- a/components/enhanced_bookmarks/enhanced_bookmark_model.h
+++ b/components/enhanced_bookmarks/enhanced_bookmark_model.h
@@ -86,6 +86,10 @@ class EnhancedBookmarkModel : public KeyedService,
                         int width,
                         int height);
 
+  // Removes all image data for the node and sets the user_removed_image flag
+  // so the server won't try to fetch a new image for the node.
+  void RemoveImageData(const BookmarkNode* node);
+
   // Returns the url and dimensions of the original scraped image of a
   // bookmark |node|.
   // Returns true if the out variables are populated, false otherwise.