Remove WebGLObject maps from WebGLRenderingContextBase and WebGLContextGroup.

third_party/WebKit/Source/modules/webgl/WebGLSharedPlatform3DObject.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 WebGLSharedPlatform3DObject_h
 #define WebGLSharedPlatform3DObject_h
 
 #include "modules/webgl/WebGLSharedObject.h"
 #include "wtf/PassRefPtr.h"
 
 namespace blink {
 
 class WebGLRenderingContextBase;
 
 class WebGLSharedPlatform3DObject : public WebGLSharedObject {
  public:
-  ~WebGLSharedPlatform3DObject() override;
-
   GLuint object() const { return m_object; }
   void setObject(GLuint);
 
  protected:
   explicit WebGLSharedPlatform3DObject(WebGLRenderingContextBase*);
 
   bool hasObject() const override;
 
   GLuint m_object;
 };
 
 }  // namespace blink
 
 #endif  // WebGLSharedPlatform3DObject_h