Remove WebGLObject maps from WebGLRenderingContextBase and WebGLContextGroup.

third_party/WebKit/Source/modules/webgl/EXTShaderTextureLOD.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/EXTShaderTextureLOD.h"
 
 namespace blink {
 
 EXTShaderTextureLOD::EXTShaderTextureLOD(WebGLRenderingContextBase* context)
     : WebGLExtension(context) {
   context->extensionsUtil()->ensureExtensionEnabled(
       "GL_EXT_shader_texture_lod");
 }
 
-EXTShaderTextureLOD::~EXTShaderTextureLOD() {}
-
 WebGLExtensionName EXTShaderTextureLOD::name() const {
   return EXTShaderTextureLODName;
 }
 
 EXTShaderTextureLOD* EXTShaderTextureLOD::create(
     WebGLRenderingContextBase* context) {
   return new EXTShaderTextureLOD(context);
 }
 
 bool EXTShaderTextureLOD::supported(WebGLRenderingContextBase* context) {
   return context->extensionsUtil()->supportsExtension(
       "GL_EXT_shader_texture_lod");
 }
 
 const char* EXTShaderTextureLOD::extensionName() {
   return "EXT_shader_texture_lod";
 }
 
 }  // namespace blink