Switch Blink to the new Web Notifications permission path.

Source/modules/notifications/Notification.cpp

Index: Source/modules/notifications/Notification.cpp
diff --git a/Source/modules/notifications/Notification.cpp b/Source/modules/notifications/Notification.cpp
index 78935834f83fb4ba6c14892e13da8eff0ae150c5..e6b38ea94120cbf01f632388a174303338ea9fea 100644
--- a/Source/modules/notifications/Notification.cpp
+++ b/Source/modules/notifications/Notification.cpp
@@ -39,6 +39,7 @@
 #include "core/page/WindowFocusAllowedIndicator.h"
 #include "modules/notifications/NotificationClient.h"
 #include "modules/notifications/NotificationController.h"
+#include "modules/notifications/NotificationPermissionClient.h"
 
 namespace blink {
 
@@ -168,8 +169,13 @@ const String& Notification::permission(ExecutionContext* context)
 
 void Notification::requestPermission(ExecutionContext* context, PassOwnPtr<NotificationPermissionCallback> callback)
 {
-    ASSERT(toDocument(context)->page());
-    NotificationController::clientFrom(context).requestPermission(context, callback);
+    // FIXME: Assert that this code-path will only be reached for Document environments
+    // when Blink supports [Exposed] annotations on class members in IDL definitions.
+
+    if (NotificationPermissionClient* permissionClient = NotificationPermissionClient::from(context)) {
+        permissionClient->requestPermission(context, callback);
+        return;
+    }
 }
 
 bool Notification::dispatchEvent(PassRefPtrWillBeRawPtr<Event> event)