Clean up pref change notification handling.

chrome/browser/extensions/extension_pref_store.cc

Index: chrome/browser/extensions/extension_pref_store.cc
diff --git a/chrome/browser/extensions/extension_pref_store.cc b/chrome/browser/extensions/extension_pref_store.cc
index 27719ed3a69345009a2b73be9c7c7156c619e99e..b590307e5d4fb7294527b493bd6cf900ffcada78 100644
--- a/chrome/browser/extensions/extension_pref_store.cc
+++ b/chrome/browser/extensions/extension_pref_store.cc
@@ -12,11 +12,9 @@
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/notification_service.h"
 
-ExtensionPrefStore::ExtensionPrefStore(Profile* profile,
-                                       PrefNotifier::PrefStoreType type)
+ExtensionPrefStore::ExtensionPrefStore(Profile* profile)
     : prefs_(new DictionaryValue()),
-      profile_(profile),
-      type_(type) {
+      profile_(profile) {
   RegisterObservers();
 }
 
@@ -36,23 +34,16 @@ void ExtensionPrefStore::InstallExtensionPref(const Extension* extension,
 
   // If this extension is not already in the stack, add it. Otherwise, update
   // or add the value of this preference, but don't change the extension's
-  // position in the stack. We store the extension even if this preference
-  // isn't registered with our PrefService, so that the ordering of extensions
-  // is consistent among all local-state and user ExtensionPrefStores.
-  PrefService* pref_service = GetPrefService();
-  // The pref_service may be NULL in unit testing.
-  bool is_registered_pref = (pref_service == NULL ||
-      pref_service->FindPreference(new_pref_path) != NULL);
+  // position in the stack.
   PrefValueMap* pref_values;
   if (i == extension_stack_.end()) {
     pref_values = new PrefValueMap();
-    if (is_registered_pref)
-      (*pref_values)[new_pref_path] = new_pref_value;
+    (*pref_values)[new_pref_path] = new_pref_value;
 
     ExtensionPrefs* extension_prefs = new ExtensionPrefs(extension,
                                                          pref_values);
     extension_stack_.push_front(extension_prefs);
-  } else if (is_registered_pref) {
+  } else {
     pref_values = (*i)->pref_values;
     delete (*pref_values)[new_pref_path];
     (*pref_values)[new_pref_path] = new_pref_value;
@@ -87,16 +78,6 @@ void ExtensionPrefStore::GetExtensionIDs(std::vector<std::string>* result) {
 // installed extensions will be trying to control any preferences, so stick
 // with this simpler algorithm until it causes a problem.
 void ExtensionPrefStore::UpdateOnePref(const char* path) {
-  PrefService* pref_service = GetPrefService();
-
-  // There are at least two PrefServices, one for local state and one for
-  // user prefs. (See browser_main.cc.) Different preferences are registered
-  // in each; if this one doesn't have the desired pref registered, we ignore
-  // it and let the other one handle it.
-  // The pref_service may be NULL in unit testing.
-  if (pref_service && !pref_service->FindPreference(path))
-      return;
-
   // Save the old value before removing it from the local cache.
   Value* my_old_value_ptr = NULL;
   prefs_->Get(path, &my_old_value_ptr);
@@ -120,19 +101,17 @@ void ExtensionPrefStore::UpdateOnePref(const char* path) {
     }
   }
 
-  if (pref_service) {
-    bool value_changed = true;
-    if (!my_old_value.get() && !my_new_value) {
-      value_changed = false;
-    } else if (my_old_value.get() &&
-               my_new_value &&
-               my_old_value->Equals(my_new_value)) {
-      value_changed = false;
-    }
-
-    if (value_changed)
-      pref_service->pref_notifier()->OnPreferenceSet(path, type_);
+  bool value_changed = true;
+  if (!my_old_value.get() && !my_new_value) {
+    value_changed = false;
+  } else if (my_old_value.get() &&
+             my_new_value &&
+             my_old_value->Equals(my_new_value)) {
+    value_changed = false;
   }
+
+  if (value_changed)
+    NotifyPrefValueChanged(path);
 }
 
 void ExtensionPrefStore::UpdatePrefs(const PrefValueMap* pref_values) {
@@ -145,12 +124,6 @@ void ExtensionPrefStore::UpdatePrefs(const PrefValueMap* pref_values) {
   }
 }
 
-PrefService* ExtensionPrefStore::GetPrefService() {
-  if (profile_)
-    return profile_->GetPrefs();
-  return g_browser_process->local_state();
-}
-
 void ExtensionPrefStore::RegisterObservers() {
   notification_registrar_.Add(this,
                               NotificationType::EXTENSION_PREF_CHANGED,