Do not keep InvalidationSets on the Oilpan heap.

third_party/WebKit/Source/core/inspector/InspectorTraceEvents.cpp

 // Copyright 2014 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 "config.h"
 #include "core/inspector/InspectorTraceEvents.h"
 
 #include "bindings/core/v8/ScriptCallStackFactory.h"
 #include "bindings/core/v8/ScriptSourceCode.h"
 #include "core/animation/Animation.h"
@@ skipping 229 matching lines @@
 PassRefPtr<TraceEvent::ConvertableToTraceFormat> InspectorStyleInvalidatorInvalidateEvent::selectorPart(Element& element, const char* reason, const InvalidationSet& invalidationSet, const String& selectorPart)
 {
     RefPtr<TracedValue> value = fillCommonPart(element, reason);
     value->beginArray("invalidationList");
     invalidationSet.toTracedValue(value.get());
     value->endArray();
     value->setString("selectorPart", selectorPart);
     return value.release();
 }
 
-PassRefPtr<TraceEvent::ConvertableToTraceFormat> InspectorStyleInvalidatorInvalidateEvent::invalidationList(Element& element, const WillBeHeapVector<RefPtrWillBeMember<InvalidationSet>>& invalidationList)
+PassRefPtr<TraceEvent::ConvertableToTraceFormat> InspectorStyleInvalidatorInvalidateEvent::invalidationList(Element& element, const Vector<RefPtr<InvalidationSet>>& invalidationList)
 {
     RefPtr<TracedValue> value = fillCommonPart(element, ElementHasPendingInvalidationList);
     value->beginArray("invalidationList");
     for (const auto& invalidationSet : invalidationList)
         invalidationSet->toTracedValue(value.get());
     value->endArray();
     return value.release();
 }
 
 PassRefPtr<TraceEvent::ConvertableToTraceFormat> InspectorStyleRecalcInvalidationTrackingEvent::data(Node* node, const StyleChangeReasonForTracing& reason)
@@ skipping 561 matching lines @@
     if (request.move())
         value->setBoolean("move", true);
     if (request.listBased())
         value->setBoolean("listBased", true);
     else if (Node* node = result.innerNode())
         setNodeInfo(value.get(), node, "nodeId", "nodeName");
     return value;
 }
 
 }