Oilpan: Replace most of RefPtrs for Event objects with oilpan's transition types

Source/core/html/canvas/CanvasRenderingContext2D.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008 Dirk Schulze <krit@webkit.org>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  * Copyright (C) 2012, 2013 Intel Corporation. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
  *
@@ skipping 145 matching lines @@
             // legacy synchronous context restoration.
             reset();
             m_isContextLost = false;
         }
     }
 }
 
 void CanvasRenderingContext2D::dispatchContextLostEvent(Timer<CanvasRenderingContext2D>*)
 {
     if (contextLostRestoredEventsEnabled()) {
-        RefPtr<Event> event(Event::createCancelable(EventTypeNames::contextlost));
+        RefPtrWillBeRawPtr<Event> event = Event::createCancelable(EventTypeNames::contextlost);
         canvas()->dispatchEvent(event);
         if (event->defaultPrevented()) {
             m_contextRestorable = false;
         }
     }
 
     // If an image buffer is present, it means the context was not lost due to
     // an eviction, but rather due to a surface failure (gpu context lost?)
     if (m_contextRestorable && canvas()->hasImageBuffer()) {
         m_tryRestoreContextAttemptCount = 0;
@@ skipping 24 matching lines @@
     }
 }
 
 void CanvasRenderingContext2D::dispatchContextRestoredEvent(Timer<CanvasRenderingContext2D>*)
 {
     if (!m_isContextLost)
         return;
     reset();
     m_isContextLost = false;
     if (contextLostRestoredEventsEnabled()) {
-        RefPtr<Event> event(Event::create(EventTypeNames::contextrestored));
+        RefPtrWillBeRawPtr<Event> event(Event::create(EventTypeNames::contextrestored));
         canvas()->dispatchEvent(event);
     }
 }
 
 void CanvasRenderingContext2D::reset()
 {
     unwindStateStack();
     m_stateStack.resize(1);
     m_stateStack.first() = adoptPtrWillBeNoop(new State());
     m_path.clear();
@@ skipping 2219 matching lines @@
     c->setAlphaAsFloat(1.0);
     c->clearShadow();
     c->setCompositeOperation(CompositeSourceOver, blink::WebBlendModeNormal);
     c->drawFocusRing(path, focusRingWidth, focusRingOutline, focusRingColor);
     c->restore();
 
     didDraw(dirtyRect);
 }
 
 } // namespace WebCore