Fix broken PrefService::preference_set() returning not all registered preferences.

chrome/browser/prefs/value_map_pref_store.h

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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_PREFS_VALUE_MAP_PREF_STORE_H_
 #define CHROME_BROWSER_PREFS_VALUE_MAP_PREF_STORE_H_
 #pragma once
 
-#include <map>
-
 #include "base/basictypes.h"
 #include "base/observer_list.h"
 #include "chrome/browser/prefs/pref_value_map.h"
 #include "chrome/common/pref_store.h"
 
 // A basic PrefStore implementation that uses a simple name-value map for
 // storing the preference values.
 class ValueMapPrefStore : public PrefStore {
  public:
+  typedef std::map<std::string, Value*>::iterator iterator;
+  typedef std::map<std::string, Value*>::const_iterator const_iterator;
+
   ValueMapPrefStore();
   virtual ~ValueMapPrefStore();
 
   // PrefStore overrides:
   virtual ReadResult GetValue(const std::string& key, Value** value) const;
   virtual void AddObserver(PrefStore::Observer* observer);
   virtual void RemoveObserver(PrefStore::Observer* observer);
 
+  iterator begin();
+  iterator end();
+  const_iterator begin() const;
+  const_iterator end() const;
+
  protected:
   // Store a |value| for |key| in the store. Also generates an notification if
   // the value changed. Assumes ownership of |value|, which must be non-NULL.
   void SetValue(const std::string& key, Value* value);
 
   // Remove the value for |key| from the store. Sends a notification if there
   // was a value to be removed.
   void RemoveValue(const std::string& key);
 
   // Notify observers about the initialization completed event.
   void NotifyInitializationCompleted();
 
  private:
   PrefValueMap prefs_;
 
   ObserverList<PrefStore::Observer, true> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(ValueMapPrefStore);
 };
 
 #endif  // CHROME_BROWSER_PREFS_VALUE_MAP_PREF_STORE_H_