Make classes and structures in web fast-allocated.

Source/web/WorkerContentSettingsClient.h

Index: Source/web/WorkerContentSettingsClient.h
diff --git a/Source/web/WorkerContentSettingsClient.h b/Source/web/WorkerContentSettingsClient.h
index 8adf79308361c466e709ef061fd7bbae153e9283..849c7b7e93582addcfdec7c7fa2b62e4fbb9ef6e 100644
--- a/Source/web/WorkerContentSettingsClient.h
+++ b/Source/web/WorkerContentSettingsClient.h
@@ -42,6 +42,7 @@ class WebWorkerContentSettingsClientProxy;
 
 class WorkerContentSettingsClient final : public NoBaseWillBeGarbageCollectedFinalized<WorkerContentSettingsClient>, public WillBeHeapSupplement<WorkerClients> {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(WorkerContentSettingsClient);
+    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(WorkerContentSettingsClient);
 public:
     static PassOwnPtrWillBeRawPtr<WorkerContentSettingsClient> create(PassOwnPtr<WebWorkerContentSettingsClientProxy>);
     virtual ~WorkerContentSettingsClient();