Revert of Oilpan: enable appcache + move DocumentLoader to the heap.

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index ba5b492d8a09ca138514212b613758868b392cdd..bb1befff42ad782cca0803922720d80baf23c5b1 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -2653,7 +2653,7 @@
             // The DocumentLoader (and thus its DocumentLoadTiming) might get destroyed
             // while dispatching the event, so protect it to prevent writing the end
             // time into freed memory.
-            RefPtrWillBeRawPtr<DocumentLoader> documentLoader = m_frame->loader().provisionalDocumentLoader();
+            RefPtr<DocumentLoader> documentLoader =  m_frame->loader().provisionalDocumentLoader();
             m_loadEventProgress = UnloadEventInProgress;
             RefPtrWillBeRawPtr<Event> unloadEvent(Event::create(EventTypeNames::unload));
             if (documentLoader && !documentLoader->timing().unloadEventStart() && !documentLoader->timing().unloadEventEnd()) {
@@ -5258,7 +5258,7 @@
     Node* node = doc->focusedElement();
     if (!node && doc->isPluginDocument()) {
         PluginDocument* pluginDocument = toPluginDocument(doc);
-        node = pluginDocument->pluginNode();
+        node =  pluginDocument->pluginNode();
     }
     if (!node && doc->isHTMLDocument())
         node = doc->body();