Removed unnecessary returning by reference.

chrome/service/service_process_prefs.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_SERVICE_SERVICE_PROCESS_PREFS_H_
 #define CHROME_SERVICE_SERVICE_PROCESS_PREFS_H_
 
 #include <string>
 
 #include "chrome/common/json_pref_store.h"
 
 namespace base {
 class DictionaryValue;
+class ListValue;
 }
 
 // Manages persistent preferences for the service process. This is basically a
 // thin wrapper around JsonPrefStore for more comfortable use.
 class ServiceProcessPrefs {
  public:
   // |file_message_loop_proxy| is the MessageLoopProxy for a thread on which
   // file I/O can be done.
   ServiceProcessPrefs(const FilePath& pref_filename,
                       base::MessageLoopProxy* file_message_loop_proxy);
   ~ServiceProcessPrefs();
 
   // Read preferences from the backing file.
   void ReadPrefs();
 
   // Write the data to the backing file.
   void WritePrefs();
 
-  // Get a string preference for |key| and store it in |result|.
-  void GetString(const std::string& key, std::string* result) const;
+  // Returns a string preference for |key|.
+  std::string GetString(const std::string& key,
+                        const std::string& default_value) const;
 
   // Set a string |value| for |key|.
   void SetString(const std::string& key, const std::string& value);
 
-  // Get a boolean preference for |key| and store it in |result|.
-  void GetBoolean(const std::string& key, bool* result) const;
+  // Returns a boolean preference for |key|.
+  bool GetBoolean(const std::string& key, bool default_value) const;
 
   // Set a boolean |value| for |key|.
   void SetBoolean(const std::string& key, bool value);
 
-  // Get a dictionary preference for |key| and store it in |result|.
-  void GetDictionary(const std::string& key,
-                     const base::DictionaryValue** result) const;
+  // Returns a dictionary preference for |key|.
+  const base::DictionaryValue* GetDictionary(const std::string& key) const;
+
+  // Returns a list for |key|.
+  const base::ListValue* GetList(const std::string& key) const;
 
   // Removes the pref specified by |key|.
   void RemovePref(const std::string& key);
 
  private:
   scoped_refptr<JsonPrefStore> prefs_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceProcessPrefs);
 };
 
 #endif  // CHROME_SERVICE_SERVICE_PROCESS_PREFS_H_