Revert CL 117933003. Re-add resource speculative prefetching code.

chrome/browser/predictors/predictor_database.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_PREDICTORS_PREDICTOR_DATABASE_H_
 #define CHROME_BROWSER_PREDICTORS_PREDICTOR_DATABASE_H_
 
 #include "base/memory/ref_counted.h"
 #include "components/keyed_service/core/keyed_service.h"
 
 class Profile;
 
 namespace sql {
 class Connection;
 }
 
 namespace predictors {
 
 class AutocompleteActionPredictorTable;
 class LoggedInPredictorTable;
 class PredictorDatabaseInternal;
+class ResourcePrefetchPredictorTables;
 
 class PredictorDatabase : public KeyedService {
  public:
   explicit PredictorDatabase(Profile* profile);
   virtual ~PredictorDatabase();
 
   scoped_refptr<AutocompleteActionPredictorTable> autocomplete_table();
+  scoped_refptr<ResourcePrefetchPredictorTables> resource_prefetch_tables();
   scoped_refptr<LoggedInPredictorTable> logged_in_table();
 
   // Used for testing.
   sql::Connection* GetDatabase();
 
  private:
   // KeyedService
   virtual void Shutdown() OVERRIDE;
 
   scoped_refptr<PredictorDatabaseInternal> db_;
 
   DISALLOW_COPY_AND_ASSIGN(PredictorDatabase);
 };
 
 }  // namespace predictors
 
 #endif  // CHROME_BROWSER_PREDICTORS_PREDICTOR_DATABASE_H_