Remove WebGLObject maps from WebGLRenderingContextBase and WebGLContextGroup.

third_party/WebKit/Source/modules/webgl/EXTBlendMinMax.cpp

 // Copyright 2014 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.
 
 #include "modules/webgl/EXTBlendMinMax.h"
 
 namespace blink {
 
 EXTBlendMinMax::EXTBlendMinMax(WebGLRenderingContextBase* context)
     : WebGLExtension(context) {
   context->extensionsUtil()->ensureExtensionEnabled("GL_EXT_blend_minmax");
 }
 
-EXTBlendMinMax::~EXTBlendMinMax() {}
-
 WebGLExtensionName EXTBlendMinMax::name() const {
   return EXTBlendMinMaxName;
 }
 
 EXTBlendMinMax* EXTBlendMinMax::create(WebGLRenderingContextBase* context) {
   return new EXTBlendMinMax(context);
 }
 
 bool EXTBlendMinMax::supported(WebGLRenderingContextBase* context) {
   return context->extensionsUtil()->supportsExtension("GL_EXT_blend_minmax");
 }
 
 const char* EXTBlendMinMax::extensionName() {
   return "EXT_blend_minmax";
 }
 
 }  // namespace blink