Make classes and structures in core/loader fast-allocated.

Source/core/loader/PrerenderHandle.h

Index: Source/core/loader/PrerenderHandle.h
diff --git a/Source/core/loader/PrerenderHandle.h b/Source/core/loader/PrerenderHandle.h
index 2e7002755a8b2f1b9474e8f730c1904973f81d7b..81848c35e4441a95cd7628260110d95b1fbba0ee 100644
--- a/Source/core/loader/PrerenderHandle.h
+++ b/Source/core/loader/PrerenderHandle.h
@@ -46,6 +46,7 @@ class PrerenderClient;
 
 class PrerenderHandle final : public NoBaseWillBeGarbageCollectedFinalized<PrerenderHandle>, public DocumentLifecycleObserver {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(PrerenderHandle);
+    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(PrerendererHandle);
     WTF_MAKE_NONCOPYABLE(PrerenderHandle);
 public:
     static PassOwnPtrWillBeRawPtr<PrerenderHandle> create(Document&, PrerenderClient*, const KURL&, unsigned prerenderRelTypes);