Minor clean up in transferToImageBitmap API

third_party/WebKit/Source/modules/webgl/WebGL2RenderingContext.h

 // Copyright 2015 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 WebGL2RenderingContext_h
 #define WebGL2RenderingContext_h
 
 #include "core/html/canvas/CanvasRenderingContextFactory.h"
 #include "modules/webgl/WebGL2RenderingContextBase.h"
 #include <memory>
@@ skipping 21 matching lines @@
       return CanvasRenderingContext::ContextWebgl2;
     }
     void onError(HTMLCanvasElement*, const String& error) override;
   };
 
   ~WebGL2RenderingContext() override;
 
   CanvasRenderingContext::ContextType getContextType() const override {
     return CanvasRenderingContext::ContextWebgl2;
   }
-  ImageBitmap* transferToImageBitmap(ExceptionState&) final;
+  ImageBitmap* transferToImageBitmap() final;
   String contextName() const override { return "WebGL2RenderingContext"; }
   void registerContextExtensions() override;
   void setCanvasGetContextResult(RenderingContext&) final;
   void setOffscreenCanvasGetContextResult(OffscreenRenderingContext&) final;
 
   DECLARE_VIRTUAL_TRACE();
 
   DECLARE_VIRTUAL_TRACE_WRAPPERS();
 
  protected:
@@ skipping 23 matching lines @@
                   context,
                   context->is3d() &&
                       WebGLRenderingContextBase::getWebGLVersion(context) == 2,
                   context.is3d() &&
                       WebGLRenderingContextBase::getWebGLVersion(&context) ==
                           2);
 
 }  // namespace blink
 
 #endif