Minor clean up in transferToImageBitmap API

third_party/WebKit/Source/modules/webgl/WebGLRenderingContext.h

 /*
  * Copyright (C) 2009 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 45 matching lines @@
       return CanvasRenderingContext::ContextWebgl;
     }
     void onError(HTMLCanvasElement*, const String& error) override;
   };
 
   ~WebGLRenderingContext() override;
 
   CanvasRenderingContext::ContextType getContextType() const override {
     return CanvasRenderingContext::ContextWebgl;
   }
-  ImageBitmap* transferToImageBitmap(ExceptionState&) final;
+  ImageBitmap* transferToImageBitmap() final;
   String contextName() const override { return "WebGLRenderingContext"; }
   void registerContextExtensions() override;
   void setCanvasGetContextResult(RenderingContext&) final;
   void setOffscreenCanvasGetContextResult(OffscreenRenderingContext&) final;
 
   EAGERLY_FINALIZE();
   DECLARE_VIRTUAL_TRACE();
 
   DECLARE_VIRTUAL_TRACE_WRAPPERS();
 
@@ skipping 39 matching lines @@
                   context,
                   context->is3d() &&
                       WebGLRenderingContextBase::getWebGLVersion(context) == 1,
                   context.is3d() &&
                       WebGLRenderingContextBase::getWebGLVersion(&context) ==
                           1);
 
 }  // namespace blink
 
 #endif  // WebGLRenderingContext_h