Remove alpha/depth/stencil/antialias from WGC3D::Attributes.

third_party/WebKit/public/platform/WebGraphicsContext3D.h

 /*
  * Copyright (C) 2012 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 35 matching lines @@
 namespace blink {
 
 // This interface abstracts the operations performed by the
 // GraphicsContext3D in order to implement WebGL. Nearly all of the
 // methods exposed on this interface map directly to entry points in
 // the OpenGL ES 2.0 API.
 class WebGraphicsContext3D : public WebNonCopyable {
 public:
     // Context creation attributes.
     struct Attributes {
-        bool alpha = true;
-        bool depth = true;
-        bool stencil = true;
-        bool antialias = true;
         bool shareResources = true;
         bool preferDiscreteGPU = false;
         bool noAutomaticFlushes = false;
         bool failIfMajorPerformanceCaveat = false;
         unsigned webGLVersion = 0;
         // FIXME: ideally this would be a WebURL, but it is currently not
         // possible to pass a WebURL by value across the WebKit API boundary.
         // See https://bugs.webkit.org/show_bug.cgi?id=103793#c13 .
         WebString topDocumentURL;
     };
@@ skipping 16 matching lines @@
 
     // This destructor needs to be public so that using classes can destroy instances if initialization fails.
     virtual ~WebGraphicsContext3D() { }
 
     virtual void setErrorMessageCallback(WebGraphicsErrorMessageCallback* callback) { }
 };
 
 } // namespace blink
 
 #endif