Remove heap/*.cpp files

sky/engine/core/loader/ImageLoader.h

Index: sky/engine/core/loader/ImageLoader.h
diff --git a/sky/engine/core/loader/ImageLoader.h b/sky/engine/core/loader/ImageLoader.h
index 049c138c8d621713b07caafb54a54bdc2be4c360..ef5951bbc82b8b5e0da4ff0af6828b0523022985 100644
--- a/sky/engine/core/loader/ImageLoader.h
+++ b/sky/engine/core/loader/ImageLoader.h
@@ -144,31 +144,8 @@ private:
 
     RawPtr<Element> m_element;
     ResourcePtr<ImageResource> m_image;
-    // FIXME: Oilpan: We might be able to remove this Persistent hack when
-    // ImageResourceClient is traceable.
-    GC_PLUGIN_IGNORE("http://crbug.com/383741")
     RefPtr<Element> m_keepAlive;
-#if ENABLE(OILPAN)
-    class ImageLoaderClientRemover {
-    public:
-        ImageLoaderClientRemover(ImageLoader& loader, ImageLoaderClient& client) : m_loader(loader), m_client(client) { }
-        ~ImageLoaderClientRemover();
-
-    private:
-        ImageLoader& m_loader;
-        ImageLoaderClient& m_client;
-    };
-    friend class ImageLoaderClientRemover;
-    // Oilpan: This ImageLoader object must outlive its clients because they
-    // need to call ImageLoader::willRemoveClient before they
-    // die. Non-Persistent HeapHashMap doesn't work well because weak processing
-    // for HeapHashMap is not triggered when both of ImageLoader and
-    // ImageLoaderClient are unreachable.
-    GC_PLUGIN_IGNORE("http://crbug.com/383742")
-    PersistentHeapHashMap<WeakMember<ImageLoaderClient>, OwnPtr<ImageLoaderClientRemover> > m_clients;
-#else
     HashSet<ImageLoaderClient*> m_clients;
-#endif
     Timer<ImageLoader> m_derefElementTimer;
     AtomicString m_failedLoadURL;
     WeakPtr<Task> m_pendingTask; // owned by Microtask