Add FilePath to base namespace.

chrome/browser/prefs/pref_service_simple.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_PREFS_PREF_SERVICE_SIMPLE_H_
 #define CHROME_BROWSER_PREFS_PREF_SERVICE_SIMPLE_H_
 
 #include "chrome/browser/prefs/pref_service.h"
 
 // A simple PrefService implementation.
 class PrefServiceSimple : public PrefService {
  public:
   // You may wish to use PrefServiceBuilder or one of its subclasses
   // for simplified construction.
   PrefServiceSimple(
       PrefNotifierImpl* pref_notifier,
       PrefValueStore* pref_value_store,
       PersistentPrefStore* user_prefs,
       DefaultPrefStore* default_store,
       base::Callback<void(PersistentPrefStore::PrefReadError)>
           read_error_callback,
       bool async);
   virtual ~PrefServiceSimple();
 
   void RegisterBooleanPref(const char* path, bool default_value);
   void RegisterIntegerPref(const char* path, int default_value);
   void RegisterDoublePref(const char* path, double default_value);
   void RegisterStringPref(const char* path, const std::string& default_value);
-  void RegisterFilePathPref(const char* path, const FilePath& default_value);
+  void RegisterFilePathPref(const char* path,
+                            const base::FilePath& default_value);
   void RegisterListPref(const char* path);
   void RegisterDictionaryPref(const char* path);
   void RegisterListPref(const char* path, base::ListValue* default_value);
   void RegisterDictionaryPref(
       const char* path, base::DictionaryValue* default_value);
   void RegisterInt64Pref(const char* path,
                          int64 default_value);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(PrefServiceSimple);
 };
 
 #endif  // CHROME_BROWSER_PREFS_PREF_SERVICE_SIMPLE_H_