Remove WebGLObject maps from WebGLRenderingContextBase and WebGLContextGroup.

third_party/WebKit/Source/modules/webgl/EXTDisjointTimerQueryWebGL2.h

 // Copyright 2016 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 EXTDisjointTimerQueryWebGL2_h
 #define EXTDisjointTimerQueryWebGL2_h
 
 #include "bindings/core/v8/ScriptValue.h"
 #include "modules/webgl/WebGLExtension.h"
 #include "modules/webgl/WebGLQuery.h"
 #include "wtf/HashMap.h"
 
 namespace blink {
 
 class WebGLRenderingContextBase;
 class WebGLQuery;
 
 class EXTDisjointTimerQueryWebGL2 final : public WebGLExtension {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   static EXTDisjointTimerQueryWebGL2* create(WebGLRenderingContextBase*);
   static bool supported(WebGLRenderingContextBase*);
   static const char* extensionName();
 
-  ~EXTDisjointTimerQueryWebGL2() override;
   WebGLExtensionName name() const override;
 
   void queryCounterEXT(WebGLQuery*, GLenum);
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   explicit EXTDisjointTimerQueryWebGL2(WebGLRenderingContextBase*);
 };
 
 }  // namespace blink
 
 #endif  // EXTDisjointTimerQueryWebGL2_h