Use Optional instead of OwnPtr for holding AllowUserAgentScript

Source/core/inspector/AsyncCallTracker.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 24 matching lines @@
 #include "core/dom/ExecutionContext.h"
 #include "core/dom/ExecutionContextTask.h"
 #include "core/events/Event.h"
 #include "core/events/EventTarget.h"
 #include "core/inspector/AsyncOperationMap.h"
 #include "core/inspector/V8DebuggerAgent.h"
 #include "core/xmlhttprequest/XMLHttpRequest.h"
 #include "core/xmlhttprequest/XMLHttpRequestUpload.h"
 #include "platform/ScriptForbiddenScope.h"
 #include "wtf/MainThread.h"
+#include "wtf/Optional.h"
 #include "wtf/text/StringBuilder.h"
 #include "wtf/text/StringHash.h"
 
 namespace {
 
 static const char setTimeoutName[] = "setTimeout";
 static const char setIntervalName[] = "setInterval";
 static const char requestAnimationFrameName[] = "requestAnimationFrame";
 static const char xhrSendName[] = "XMLHttpRequest.send";
 static const char enqueueMutationRecordName[] = "Mutation";
@@ skipping 179 matching lines @@
     } else {
         willFireAsyncCall(V8DebuggerAgent::unknownAsyncOperationId);
     }
     return true;
 }
 
 void AsyncCallTracker::didEnqueueEvent(EventTarget* eventTarget, Event* event)
 {
     ASSERT(eventTarget->executionContext());
     ASSERT(m_debuggerAgent->trackingAsyncCalls());
-    OwnPtr<ScriptForbiddenScope::AllowUserAgentScript> allowScripting;
+    Optional<ScriptForbiddenScope::AllowUserAgentScript> allowScripting;
     if (isMainThread())
-        allowScripting = adoptPtr(new ScriptForbiddenScope::AllowUserAgentScript());
+        allowScripting.emplace();
     int operationId = m_debuggerAgent->traceAsyncOperationStarting(event->type());
     ExecutionContextData* data = createContextDataIfNeeded(eventTarget->executionContext());
     data->m_eventCallChains.set(event, operationId);
 }
 
 void AsyncCallTracker::didRemoveEvent(EventTarget* eventTarget, Event* event)
 {
     ASSERT(eventTarget->executionContext());
     ASSERT(m_debuggerAgent->trackingAsyncCalls());
     if (ExecutionContextData* data = m_executionContextDataMap.get(eventTarget->executionContext()))
@@ skipping 176 matching lines @@
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_executionContextDataMap);
     visitor->trace(m_debuggerAgent);
     visitor->trace(m_instrumentingAgents);
 #endif
     V8DebuggerAgent::AsyncCallTrackingListener::trace(visitor);
 }
 
 } // namespace blink