Add FilePath setter/getter to pref service....

chrome/test/testing_profile.h

 // Copyright (c) 2006-2008 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_TEST_TESTING_PROFILE_H_
 #define CHROME_TEST_TESTING_PROFILE_H_
 
 #include "base/base_paths.h"
 #include "base/file_path.h"
 #include "base/path_service.h"
@@ skipping 84 matching lines @@
   }
   virtual WebDataService* GetWebDataService(ServiceAccessType access) {
     return NULL;
   }
   virtual PrefService* GetPrefs() {
     FilePath prefs_filename;
     PathService::Get(base::DIR_TEMP, &prefs_filename);
     prefs_filename =
         prefs_filename.Append(FILE_PATH_LITERAL("TestPreferences"));
     if (!prefs_.get()) {
-      prefs_.reset(new PrefService(prefs_filename.ToWStringHack()));
+      prefs_.reset(new PrefService(prefs_filename));
       Profile::RegisterUserPrefs(prefs_.get());
       browser::RegisterAllPrefs(prefs_.get(), prefs_.get());
     }
     return prefs_.get();
   }
   virtual TemplateURLModel* GetTemplateURLModel() {
     return template_url_model_.get();
   }
   virtual TemplateURLFetcher* GetTemplateURLFetcher() {
     return NULL;
@@ skipping 105 matching lines @@
 
   std::wstring id_;
 
   bool off_the_record_;
 
   // Did the last session exit cleanly? Default is true.
   bool last_session_exited_cleanly_;
 };
 
 #endif  // CHROME_TEST_TESTING_PROFILE_H_