Make classes and structures in core/events and core/fetch fast-allocated.

Source/core/events/ScopedEventQueue.h

Index: Source/core/events/ScopedEventQueue.h
diff --git a/Source/core/events/ScopedEventQueue.h b/Source/core/events/ScopedEventQueue.h
index 59dc56fc54b74efa802a81d3a57656a18f625ba1..f6ba2f93be4eac034f558cc72f9d178be968b88e 100644
--- a/Source/core/events/ScopedEventQueue.h
+++ b/Source/core/events/ScopedEventQueue.h
@@ -66,7 +66,7 @@ private:
 
 class EventQueueScope {
     WTF_MAKE_NONCOPYABLE(EventQueueScope);
-
+    STACK_ALLOCATED();
 public:
     EventQueueScope() { ScopedEventQueue::instance()->incrementScopingLevel(); }
     ~EventQueueScope() { ScopedEventQueue::instance()->decrementScopingLevel(); }