Remove WebGLObject maps from WebGLRenderingContextBase and WebGLContextGroup.

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

 // 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.
 
 #include "modules/webgl/WebGLCompressedTextureETC.h"
 
 #include "modules/webgl/WebGLRenderingContextBase.h"
 
 namespace blink {
 
 WebGLCompressedTextureETC::WebGLCompressedTextureETC(
     WebGLRenderingContextBase* context)
     : WebGLExtension(context) {
   context->addCompressedTextureFormat(GL_COMPRESSED_R11_EAC);
   context->addCompressedTextureFormat(GL_COMPRESSED_SIGNED_R11_EAC);
   context->addCompressedTextureFormat(GL_COMPRESSED_RGB8_ETC2);
   context->addCompressedTextureFormat(GL_COMPRESSED_SRGB8_ETC2);
   context->addCompressedTextureFormat(
       GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2);
   context->addCompressedTextureFormat(
       GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2);
   context->addCompressedTextureFormat(GL_COMPRESSED_RG11_EAC);
   context->addCompressedTextureFormat(GL_COMPRESSED_SIGNED_RG11_EAC);
   context->addCompressedTextureFormat(GL_COMPRESSED_RGBA8_ETC2_EAC);
   context->addCompressedTextureFormat(GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC);
 }
 
-WebGLCompressedTextureETC::~WebGLCompressedTextureETC() {}
-
 WebGLExtensionName WebGLCompressedTextureETC::name() const {
   return WebGLCompressedTextureETCName;
 }
 
 WebGLCompressedTextureETC* WebGLCompressedTextureETC::create(
     WebGLRenderingContextBase* context) {
   return new WebGLCompressedTextureETC(context);
 }
 
 bool WebGLCompressedTextureETC::supported(WebGLRenderingContextBase* context) {
   Extensions3DUtil* extensionsUtil = context->extensionsUtil();
   return extensionsUtil->supportsExtension(
       "GL_CHROMIUM_compressed_texture_etc");
 }
 
 const char* WebGLCompressedTextureETC::extensionName() {
   return "WEBGL_compressed_texture_etc";
 }
 
 }  // namespace blink