Remove PrefServiceSimple, replacing it with PrefService and PrefRegistrySimple.

chrome/browser/prefs/pref_value_store.h

Index: chrome/browser/prefs/pref_value_store.h
diff --git a/chrome/browser/prefs/pref_value_store.h b/chrome/browser/prefs/pref_value_store.h
index 404796ba8ab37ab092116348f057267b63a494a3..9a2b2bf30e91a4f22615d0a4baed61ef9f064a17 100644
--- a/chrome/browser/prefs/pref_value_store.h
+++ b/chrome/browser/prefs/pref_value_store.h
@@ -17,6 +17,7 @@
 #include "base/values.h"
 
 class PrefNotifier;
+class PrefRegistry;
 class PrefStore;
 
 // The PrefValueStore manages various sources of values for Preferences
@@ -49,6 +50,14 @@ class PrefValueStore {
                  PrefStore* recommended_prefs,
                  PrefStore* default_prefs,
                  PrefNotifier* pref_notifier);
+  // Same except retrieves default_prefs from PrefRegistry.
+  PrefValueStore(PrefStore* managed_prefs,
+                 PrefStore* extension_prefs,
+                 PrefStore* command_line_prefs,
+                 PrefStore* user_prefs,
+                 PrefStore* recommended_prefs,
+                 PrefRegistry* pref_registry,

[Mattias Nissler (ping if slow), 2013/01/25 14:57:11]

PrefValueStore shouldn't have to know about PrefRegistry, PrefService should
just get the default pref store pointer from PrefRegistry and pass it on here.

[Jói, 2013/01/29 16:10:02]

Done.

+                 PrefNotifier* pref_notifier);
   virtual ~PrefValueStore();
 
   // Creates a clone of this PrefValueStore with PrefStores overwritten