Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.h

 // Copyright 2016 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.
 
 #ifndef OffscreenCanvasRenderingContext2D_h
 #define OffscreenCanvasRenderingContext2D_h
 
 #include "core/html/canvas/CanvasContextCreationAttributes.h"
 #include "modules/canvas2d/BaseRenderingContext2D.h"
 #include "modules/offscreencanvas/OffscreenCanvasRenderingContext.h"
 #include "modules/offscreencanvas/OffscreenCanvasRenderingContextFactory.h"
 
 namespace blink {
 
 class MODULES_EXPORT OffscreenCanvasRenderingContext2D final : public OffscreenCanvasRenderingContext, public BaseRenderingContext2D {
     DEFINE_WRAPPERTYPEINFO();
-    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(OffscreenCanvasRenderingContext2D);
+    USING_GARBAGE_COLLECTED_MIXIN(OffscreenCanvasRenderingContext2D);
 public:
     class Factory : public OffscreenCanvasRenderingContextFactory {
     public:
         Factory() {}
         ~Factory() override {}
 
         OffscreenCanvasRenderingContext* create(OffscreenCanvas* canvas, const CanvasContextCreationAttributes& attrs) override
         {
             return new OffscreenCanvasRenderingContext2D(canvas, attrs);
         }
@@ skipping 32 matching lines @@
     void didDraw(const SkIRect& dirtyRect) final;
 
     bool stateHasFilter() final;
     SkImageFilter* stateGetFilter() final;
 
     void validateStateStack() final;
 
     bool hasAlpha() const override { return m_hasAlpha; }
     bool isContextLost() const override;
 
-    PassRefPtrWillBeRawPtr<ImageBitmap> transferToImageBitmap(ExceptionState&) final;
+    RawPtr<ImageBitmap> transferToImageBitmap(ExceptionState&) final;
 
 protected:
     OffscreenCanvasRenderingContext2D(OffscreenCanvas*, const CanvasContextCreationAttributes& attrs);
     DECLARE_VIRTUAL_TRACE();
 
 private:
     bool m_hasAlpha;
     bool m_originClean = true;
     OwnPtr<ImageBuffer> m_imageBuffer;
 };
 
 } // namespace blink
 
 #endif // OffscreenCanvasRenderingContext2D_h