Remove WebGLObject maps from WebGLRenderingContextBase and WebGLContextGroup.

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

 /*
  * Copyright (C) 2011 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 18 matching lines @@
 #include "modules/webgl/WebGLObject.h"
 
 namespace blink {
 
 class WebGLRenderingContextBase;
 
 // WebGLContextObject the base class for objects that are owned by a specific
 // WebGLRenderingContextBase.
 class WebGLContextObject : public WebGLObject {
  public:
-  ~WebGLContextObject() override;
-
   WebGLRenderingContextBase* context() const { return m_context; }
 
   bool validate(const WebGLContextGroup*,
                 const WebGLRenderingContextBase* context) const final {
     return context == m_context;

[Zhenyao Mo, 2016/12/02 18:58:39]

Do we also want to check the numberOfContextLosses here?

[Ken Russell (switch to Gerrit), 2016/12/02 22:13:38]

Sorry, forgot to reply to your comment. Yes, thank you for catching this; that
was a bug. Fixed. (Surprising that the WEBGL_lose_context extension test didn't
catch this -- I'll look into improving it.)

   }
 
-  void detachContext();
-
   DECLARE_VIRTUAL_TRACE();
 
  protected:
   explicit WebGLContextObject(WebGLRenderingContextBase*);
 
   bool hasGroupOrContext() const final { return m_context; }
 
+  uint32_t currentNumberOfContextLosses() const final;
+
   gpu::gles2::GLES2Interface* getAGLInterface() const final;
 
  private:
   Member<WebGLRenderingContextBase> m_context;
 };
 
 }  // namespace blink
 
 #endif  // WebGLContextObject_h