Remove PrefServiceSimple, replacing it with PrefService and PrefRegistrySimple.

base/prefs/public/pref_service_base.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.
 
 // This is the base interface for a preference services that provides
 // a way to access the application's current preferences.
 //
 // This base interface assumes all preferences are local.  See
 // SyncablePrefServiceBase for the interface to a preference service
 // that stores preferences that can be synced.
@@ skipping 86 matching lines @@
   };
 
   // Returns true if the preference for the given preference name is available
   // and is managed.
   virtual bool IsManagedPreference(const char* pref_name) const = 0;
 
   // Returns |true| if a preference with the given name is available and its
   // value can be changed by the user.
   virtual bool IsUserModifiablePreference(const char* pref_name) const = 0;
 
-  // Unregisters a preference.
-  virtual void UnregisterPreference(const char* path) = 0;
-
   // Look up a preference.  Returns NULL if the preference is not
   // registered.
   virtual const Preference* FindPreference(const char* pref_name) const = 0;
 
   // If the path is valid and the value at the end of the path matches the type
   // specified, it will return the specified value.  Otherwise, the default
   // value (set when the pref was registered) will be returned.
   virtual bool GetBoolean(const char* path) const = 0;
   virtual int GetInteger(const char* path) const = 0;
   virtual double GetDouble(const char* path) const = 0;
@@ skipping 47 matching lines @@
   //
   // If the pref at the given path changes, we call the observer's
   // OnPreferenceChanged method. Note that observers should not call
   // these methods directly but rather use a PrefChangeRegistrar to
   // make sure the observer gets cleaned up properly.
   virtual void AddPrefObserver(const char* path, PrefObserver* obs) = 0;
   virtual void RemovePrefObserver(const char* path, PrefObserver* obs) = 0;
 };
 
 #endif  // BASE_PREFS_PUBLIC_PREF_SERVICE_BASE_H_