[part 2] Make classes and structures in modules fast-allocated.

Source/modules/indexeddb/IDBEventDispatcher.h

Index: Source/modules/indexeddb/IDBEventDispatcher.h
diff --git a/Source/modules/indexeddb/IDBEventDispatcher.h b/Source/modules/indexeddb/IDBEventDispatcher.h
index f76c99ca57714fbaffeaf8b2573530823f306d40..ba4c3ffc5285bcc902964a3f2c3d0c91b97b075f 100644
--- a/Source/modules/indexeddb/IDBEventDispatcher.h
+++ b/Source/modules/indexeddb/IDBEventDispatcher.h
@@ -30,6 +30,7 @@
 #define IDBEventDispatcher_h
 
 #include "platform/heap/Handle.h"
+#include "wtf/Allocator.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 
@@ -39,11 +40,9 @@ class Event;
 class EventTarget;
 
 class IDBEventDispatcher {
+    STATIC_ONLY(IDBEventDispatcher);
 public:
     static bool dispatch(Event*, WillBeHeapVector<RefPtrWillBeMember<EventTarget>>&); // The target first and then its ancestors in order of how the event bubbles.
-
-private:
-    IDBEventDispatcher();
 };
 
 } // namespace blink