Make ShortcutsBackend a ProfileKeyedService.

chrome/browser/autocomplete/shortcuts_provider.h

 // Copyright (c) 2012 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_AUTOCOMPLETE_SHORTCUTS_PROVIDER_H_
 #define CHROME_BROWSER_AUTOCOMPLETE_SHORTCUTS_PROVIDER_H_
 #pragma once
 
 #include <set>
 #include <string>
@@ skipping 55 matching lines @@
   // {{0, MATCH}, {2, NONE}, {12, MATCH}, {14, NONE}, {18, URL|MATCH},
   // {20, URL}, {37, NONE}}
   static ACMatchClassifications ClassifyAllMatchesInString(
       const string16& find_text,
       const string16& text,
       const ACMatchClassifications& original_class);
 
   // Returns iterator to first item in |shortcuts_map_| matching |keyword|.
   // Returns shortcuts_map_.end() if there are no matches.
   history::ShortcutsBackend::ShortcutMap::const_iterator FindFirstMatch(
-      const string16& keyword);
+      const string16& keyword,
+      history::ShortcutsBackend* backend);
 
   static int CalculateScore(
       const string16& terms,
       const history::ShortcutsBackend::Shortcut& shortcut);
 
-  // For unit-test only.
-  void set_shortcuts_backend(history::ShortcutsBackend* shortcuts_backend);
-
   std::string languages_;
   bool initialized_;
-
-  scoped_refptr<history::ShortcutsBackend> shortcuts_backend_;
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_SHORTCUTS_PROVIDER_H_