Reduce the memory usage of bookmarks storage

chrome/browser/bookmarks/chrome_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 CHROME_BROWSER_BOOKMARKS_CHROME_BOOKMARK_CLIENT_H_
 #define CHROME_BROWSER_BOOKMARKS_CHROME_BOOKMARK_CLIENT_H_
 
 #include <set>
 #include <vector>
 
@@ skipping 35 matching lines @@
   bool SupportsTypedCountForUrls() override;
   void GetTypedCountForUrls(UrlTypedCountMap* url_typed_count_map) override;
   bool IsPermanentNodeVisible(
       const bookmarks::BookmarkPermanentNode* node) override;
   void RecordAction(const base::UserMetricsAction& action) override;
   bookmarks::LoadExtraCallback GetLoadExtraNodesCallback() override;
   bool CanSetPermanentNodeTitle(
       const bookmarks::BookmarkNode* permanent_node) override;
   bool CanSyncNode(const bookmarks::BookmarkNode* node) override;
   bool CanBeEditedByUser(const bookmarks::BookmarkNode* node) override;
+  std::vector<std::string> ExecludedMetaKeys() override;
 
  private:
   // Pointer to the associated Profile. Must outlive ChromeBookmarkClient.
   Profile* profile_;
 
   // Pointer to the ManagedBookmarkService responsible for bookmark policy. May
   // be null during testing.
   bookmarks::ManagedBookmarkService* managed_bookmark_service_;
 
 #if defined(OS_ANDROID)
   // Owns the observer used by Offline Page listening to Bookmark Model events.
   std::unique_ptr<offline_pages::OfflinePageBookmarkObserver>
       offline_page_observer_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBookmarkClient);
 };
 
 #endif  // CHROME_BROWSER_BOOKMARKS_CHROME_BOOKMARK_CLIENT_H_