Revert of Rename Heap to ThreadHeap

third_party/WebKit/Source/core/dom/IntersectionObserver.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/dom/IntersectionObserver.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "core/css/parser/CSSParserTokenRange.h"
 #include "core/css/parser/CSSTokenizer.h"
 #include "core/dom/Element.h"
@@ skipping 136 matching lines @@
     default:
         ASSERT_NOT_REACHED();
         break;
     }
     root.document().ensureIntersectionObserverController().addTrackedObserver(*this);
 }
 
 #if ENABLE(OILPAN)
 void IntersectionObserver::clearWeakMembers(Visitor* visitor)
 {
-    if (ThreadHeap::isHeapObjectAlive(m_root))
+    if (Heap::isHeapObjectAlive(m_root))
         return;
     disconnect();
     m_root = nullptr;
 }
 #endif
 
 LayoutObject* IntersectionObserver::rootLayoutObject() const
 {
     Node* node = rootNode();
     if (node->isDocumentNode())
@@ skipping 138 matching lines @@
 
 DEFINE_TRACE(IntersectionObserver)
 {
     visitor->template registerWeakMembers<IntersectionObserver, &IntersectionObserver::clearWeakMembers>(this);
     visitor->trace(m_callback);
     visitor->trace(m_observations);
     visitor->trace(m_entries);
 }
 
 } // namespace blink