Fix crash on NTP related to multi-profile extensions.

chrome/browser/ui/webui/ntp/app_launcher_handler.cc

Index: chrome/browser/ui/webui/ntp/app_launcher_handler.cc
diff --git a/chrome/browser/ui/webui/ntp/app_launcher_handler.cc b/chrome/browser/ui/webui/ntp/app_launcher_handler.cc
index 0355ee7e2ad6279726f037212487ea77ff267862..9be4b23bbe3604c12885a9f07deade217267d2f9 100644
--- a/chrome/browser/ui/webui/ntp/app_launcher_handler.cc
+++ b/chrome/browser/ui/webui/ntp/app_launcher_handler.cc
@@ -259,6 +259,10 @@ void AppLauncherHandler::Observe(int type,
 
   switch (type) {
     case chrome::NOTIFICATION_APP_NOTIFICATION_STATE_CHANGED: {
+      Profile* profile = Source<Profile>(source).ptr();
+      if (!Profile::FromWebUI(web_ui_)->IsSameProfile(profile))
+        return;
+
       const std::string& id = *Details<const std::string>(details).ptr();
       const AppNotification* notification =
           extension_service_->app_notification_manager()->GetLast(id);
@@ -441,7 +445,8 @@ void AppLauncherHandler::HandleGetApps(const ListValue* args) {
   // b) Conceptually, it doesn't really make sense to count a
   //    prefchange-triggered refresh as a promo 'view'.
   AppsPromo* apps_promo = extension_service_->apps_promo();
-  PrefService* prefs = Profile::FromWebUI(web_ui_)->GetPrefs();
+  Profile* profile = Profile::FromWebUI(web_ui_);
+  PrefService* prefs = profile->GetPrefs();
   bool apps_promo_just_expired = false;
   if (apps_promo->ShouldShowPromo(extension_service_->GetAppIds(),
                                   &apps_promo_just_expired)) {
@@ -472,15 +477,15 @@ void AppLauncherHandler::HandleGetApps(const ListValue* args) {
     registrar_.Add(this, chrome::NOTIFICATION_APP_NOTIFICATION_STATE_CHANGED,
         NotificationService::AllSources());
     registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_LOADED,
-        NotificationService::AllSources());
+        Source<Profile>(profile));
     registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_UNLOADED,
-        NotificationService::AllSources());
+        Source<Profile>(profile));
     registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_LAUNCHER_REORDERED,
-        NotificationService::AllSources());
+        Source<ExtensionPrefs>(extension_service_->extension_prefs()));
     registrar_.Add(this, chrome::NOTIFICATION_WEB_STORE_PROMO_LOADED,
-        NotificationService::AllSources());
+        Source<Profile>(profile));
     registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_INSTALL_ERROR,
-        NotificationService::AllSources());
+        Source<Profile>(profile));
   }
   if (pref_change_registrar_.IsEmpty()) {
     pref_change_registrar_.Init(