Change SimulatedMouseEvent's adoptRef() to adoptRefWillBeRefCountedGarbageCollected()

I forgot to replace a couple of adoptRef()s in r170164.
SimulatedMouseEvent's adoptRef() was another left-over.

BUG=340522
TBR=ager

Review URL: https://codereview.chromium.org/216283002

git-svn-id: svn://svn.chromium.org/blink/trunk@170266 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/events/MouseEvent.cpp

@@ -196,9 +196,9 @@ void MouseEvent::trace(Visitor* visitor)
     MouseRelatedEvent::trace(visitor);
 }
 
-PassRefPtr<SimulatedMouseEvent> SimulatedMouseEvent::create(const AtomicString& eventType, PassRefPtrWillBeRawPtr<AbstractView> view, PassRefPtr<Event> underlyingEvent)
+PassRefPtrWillBeRawPtr<SimulatedMouseEvent> SimulatedMouseEvent::create(const AtomicString& eventType, PassRefPtrWillBeRawPtr<AbstractView> view, PassRefPtr<Event> underlyingEvent)
 {
-    return adoptRef(new SimulatedMouseEvent(eventType, view, underlyingEvent));
+    return adoptRefWillBeRefCountedGarbageCollected(new SimulatedMouseEvent(eventType, view, underlyingEvent));
 }
 
 SimulatedMouseEvent::~SimulatedMouseEvent()

third_party/WebKit/Source/core/events/MouseEvent.h

@@ -113,7 +113,7 @@ private:
 
 class SimulatedMouseEvent FINAL : public MouseEvent {
 public:
-    static PassRefPtr<SimulatedMouseEvent> create(const AtomicString& eventType, PassRefPtrWillBeRawPtr<AbstractView>, PassRefPtr<Event> underlyingEvent);
+    static PassRefPtrWillBeRawPtr<SimulatedMouseEvent> create(const AtomicString& eventType, PassRefPtrWillBeRawPtr<AbstractView>, PassRefPtr<Event> underlyingEvent);
     virtual ~SimulatedMouseEvent();
 
     virtual void trace(Visitor*) OVERRIDE;