Remove VisitedLink dependency on rest of chrome

chrome/browser/history/history_backend.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_HISTORY_HISTORY_BACKEND_H_
 #define CHROME_BROWSER_HISTORY_HISTORY_BACKEND_H_
 
 #include <set>
 #include <string>
 #include <utility>
@@ skipping 155 matching lines @@
   void SetPageContents(const GURL& url, const string16& contents);
 
   // Querying ------------------------------------------------------------------
 
   // ScheduleAutocomplete() never frees |provider| (which is globally live).
   // It passes |params| on to the autocomplete system which will eventually
   // free it.
   void ScheduleAutocomplete(HistoryURLProvider* provider,
                             HistoryURLProviderParams* params);
 
-  void IterateURLs(HistoryService::URLEnumerator* enumerator);
+  void IterateURLs(
+      const scoped_refptr<VisitedLinkDelegate::URLEnumerator>& enumerator);
   void QueryURL(scoped_refptr<QueryURLRequest> request,
                 const GURL& url,
                 bool want_visits);
   void QueryHistory(scoped_refptr<QueryHistoryRequest> request,
                     const string16& text_query,
                     const QueryOptions& options);
   void QueryRedirectsFrom(scoped_refptr<QueryRedirectsRequest> request,
                           const GURL& url);
   void QueryRedirectsTo(scoped_refptr<QueryRedirectsRequest> request,
                         const GURL& url);
@@ skipping 714 matching lines @@
   // Used to provide the Android ContentProvider APIs.
   scoped_ptr<AndroidProviderBackend> android_provider_backend_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(HistoryBackend);
 };
 
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_HISTORY_BACKEND_H_