Provide default implementation for BookmarkClient::PreferTouchIcon

components/bookmarks/core/browser/bookmark_client.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_BOOKMARKS_CORE_BROWSER_BOOKMARK_CLIENT_H_
 #define COMPONENTS_BOOKMARKS_CORE_BROWSER_BOOKMARK_CLIENT_H_
 
 #include <set>
 #include <vector>
 
@@ skipping 20 matching lines @@
       FaviconImageCallback;
 
   // Types representing a set of BookmarkNode and a mapping from BookmarkNode
   // to the number of time the corresponding URL has been typed by the user in
   // the Omnibox.
   typedef std::set<const BookmarkNode*> NodeSet;
   typedef std::pair<const BookmarkNode*, int> NodeTypedCountPair;
   typedef std::vector<NodeTypedCountPair> NodeTypedCountPairs;
 
   // Returns true if the embedder favors touch icons over favicons.
-  virtual bool PreferTouchIcon() = 0;
+  virtual bool PreferTouchIcon();
 
   // Requests the favicon of any of |icon_types| whose pixel sizes most
   // closely match |desired_size_in_dip| (if value is 0, the largest favicon
   // is returned) and desired scale factor for |page_url|. |callback| is run
   // when the bits have been fetched. |icon_types| can be any combination of
   // IconType value, but only one icon will be returned.
   virtual base::CancelableTaskTracker::TaskId GetFaviconImageForURL(
       const GURL& page_url,
       int icon_types,
       int desired_size_in_dip,
@@ skipping 11 matching lines @@
 
   // Wrapper around RecordAction defined in base/metrics/user_metrics.h
   // that ensure that the action is posted from the correct thread.
   virtual void RecordAction(const base::UserMetricsAction& action) = 0;
 
  protected:
   virtual ~BookmarkClient() {}
 };
 
 #endif  // COMPONENTS_BOOKMARKS_CORE_BROWSER_BOOKMARK_CLIENT_H_