Reinitialize LocalState's CommandLinePrefStore after about_flags updates the command line.

chrome/common/pref_store.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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_COMMON_PREF_STORE_H_
 #define CHROME_COMMON_PREF_STORE_H_
 #pragma once
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 31 matching lines @@
     READ_USE_DEFAULT,
     // No value present.
     READ_NO_VALUE,
   };
 
   PrefStore() {}
 
   // Add and remove observers.
   virtual void AddObserver(Observer* observer) {}
   virtual void RemoveObserver(Observer* observer) {}
+  virtual size_t NumberOfObservers() const;
 
   // Whether the store has completed all asynchronous initialization.
   virtual bool IsInitializationComplete() const;
 
   // Get the value for a given preference |key| and stores it in |*result|.
   // |*result| is only modified if the return value is READ_OK and if |result|
   // is not NULL. Ownership of the |*result| value remains with the PrefStore.
   virtual ReadResult GetValue(const std::string& key,
                               const base::Value** result) const = 0;
 
  protected:
   friend class base::RefCounted<PrefStore>;
   virtual ~PrefStore() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(PrefStore);
 };
 
 #endif  // CHROME_COMMON_PREF_STORE_H_