Oilpan: fix build after r181867.

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/ScriptGCEvent.h"
 #include "bindings/core/v8/ScriptSourceCode.h"
@@ skipping 104 matching lines @@
 PassRefPtr<TraceEvent::ConvertableToTraceFormat> InspectorLayoutInvalidationTrackingEvent::data(const RenderObject* renderer)
 {
     ASSERT(renderer);
     RefPtr<TracedValue> value = TracedValue::create();
     value->setString("frame", toHexString(renderer->frame()));
     value->setString("rendererId", toHexString(renderer));
     if (Node* generatingNode = renderer->generatingNode()) {
         value->setString("nodeName", generatingNode->debugName());
         value->setInteger("nodeId", InspectorNodeIds::idForNode(generatingNode));
     }
-    RefPtr<ScriptCallStack> callstack = createScriptCallStack(maxInvalidationTrackingCallstackSize, true);
+    RefPtrWillBeRawPtr<ScriptCallStack> callstack = createScriptCallStack(maxInvalidationTrackingCallstackSize, true);
     value->setString("callstack", callstack ? callstack->buildInspectorArray()->toJSONString() : "[]");
     return value;
 }
 
 PassRefPtr<TraceEvent::ConvertableToTraceFormat> InspectorSendRequestEvent::data(unsigned long identifier, LocalFrame* frame, const ResourceRequest& request)
 {
     String requestId = IdentifiersFactory::requestId(identifier);
 
     RefPtr<TracedValue> value = TracedValue::create();
     value->setString("requestId", requestId);
@@ skipping 239 matching lines @@
 
 PassRefPtr<TraceEvent::ConvertableToTraceFormat> InspectorTracingSessionIdForWorkerEvent::data(const String& sessionId, WorkerThread* workerThread)
 {
     RefPtr<TracedValue> value = TracedValue::create();
     value->setString("sessionId", sessionId);
     value->setDouble("workerThreadId", workerThread->platformThreadId());
     return value;
 }
 
 }