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

Source/modules/mediastream/UserMediaController.h

Index: Source/modules/mediastream/UserMediaController.h
diff --git a/Source/modules/mediastream/UserMediaController.h b/Source/modules/mediastream/UserMediaController.h
index 9d7a0110bc04f318cf89edc3a2011ccd9c03f45e..0655dd64ff033720c66505ae3e57dc22c7faddf9 100644
--- a/Source/modules/mediastream/UserMediaController.h
+++ b/Source/modules/mediastream/UserMediaController.h
@@ -37,6 +37,7 @@ class UserMediaRequest;
 class UserMediaController final : public NoBaseWillBeGarbageCollected<UserMediaController>, public WillBeHeapSupplement<LocalFrame> {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(UserMediaController);
     DECLARE_EMPTY_VIRTUAL_DESTRUCTOR_WILL_BE_REMOVED(UserMediaController);
+    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(UserMediaController);
 public:
     static PassOwnPtrWillBeRawPtr<UserMediaController> create(UserMediaClient*);