Remove WebGLObject maps from WebGLRenderingContextBase and WebGLContextGroup.

third_party/WebKit/Source/modules/webgl/WebGLCompressedTextureETC1.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/WebGLCompressedTextureETC1.h"
 
 #include "modules/webgl/WebGLRenderingContextBase.h"
 
 namespace blink {
 
 WebGLCompressedTextureETC1::WebGLCompressedTextureETC1(
     WebGLRenderingContextBase* context)
     : WebGLExtension(context) {
   context->addCompressedTextureFormat(GL_ETC1_RGB8_OES);
 }
 
-WebGLCompressedTextureETC1::~WebGLCompressedTextureETC1() {}
-
 WebGLExtensionName WebGLCompressedTextureETC1::name() const {
   return WebGLCompressedTextureETC1Name;
 }
 
 WebGLCompressedTextureETC1* WebGLCompressedTextureETC1::create(
     WebGLRenderingContextBase* context) {
   return new WebGLCompressedTextureETC1(context);
 }
 
 bool WebGLCompressedTextureETC1::supported(WebGLRenderingContextBase* context) {
   Extensions3DUtil* extensionsUtil = context->extensionsUtil();
   bool webgl1 = !context->isWebGL2OrHigher();
   bool etc1 =
       extensionsUtil->supportsExtension("GL_OES_compressed_ETC1_RGB8_texture");
   bool etc =
       extensionsUtil->supportsExtension("GL_CHROMIUM_compressed_texture_etc");
   return (webgl1 || etc) && etc1;
 }
 
 const char* WebGLCompressedTextureETC1::extensionName() {
   return "WEBGL_compressed_texture_etc1";
 }
 
 }  // namespace blink