Remove WebGLObject maps from WebGLRenderingContextBase and WebGLContextGroup.

third_party/WebKit/Source/modules/webgl/EXTsRGB.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/EXTsRGB.h"
 
 #include "modules/webgl/WebGLRenderingContextBase.h"
 
 namespace blink {
 
 EXTsRGB::EXTsRGB(WebGLRenderingContextBase* context) : WebGLExtension(context) {
   context->extensionsUtil()->ensureExtensionEnabled("GL_EXT_sRGB");
 }
 
-EXTsRGB::~EXTsRGB() {}
-
 WebGLExtensionName EXTsRGB::name() const {
   return EXTsRGBName;
 }
 
 EXTsRGB* EXTsRGB::create(WebGLRenderingContextBase* context) {
   return new EXTsRGB(context);
 }
 
 bool EXTsRGB::supported(WebGLRenderingContextBase* context) {
   Extensions3DUtil* extensionsUtil = context->extensionsUtil();
   return extensionsUtil->supportsExtension("GL_EXT_sRGB");
 }
 
 const char* EXTsRGB::extensionName() {
   return "EXT_sRGB";
 }
 
 }  // namespace blink