Add an ExtensionPrefStore, layered between the user prefs nad the managed pre...

chrome/browser/extensions/test_extension_prefs.cc

Index: chrome/browser/extensions/test_extension_prefs.cc
===================================================================
--- chrome/browser/extensions/test_extension_prefs.cc	(revision 52073)
+++ chrome/browser/extensions/test_extension_prefs.cc	(working copy)
@@ -42,12 +42,7 @@
   }
 
   // Create a |PrefService| instance that contains only user defined values.
-  pref_service_.reset(new PrefService(new PrefValueStore(
-    NULL, /* no managed preference values */
-    new JsonPrefStore( /* user defined preferemnce values*/
-        preferences_file_,
-        ChromeThread::GetMessageLoopProxyForThread(ChromeThread::FILE)),
-    NULL /* no suggested preference values*/)));
+  pref_service_.reset(PrefService::CreateUserPrefService(preferences_file_));
   ExtensionPrefs::RegisterUserPrefs(pref_service_.get());
   prefs_.reset(new ExtensionPrefs(pref_service_.get(), temp_dir_.path()));
 }