Remove WebGLObject maps from WebGLRenderingContextBase and WebGLContextGroup.

third_party/WebKit/Source/modules/webgl/WebGLCompressedTextureS3TCsRGB.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/WebGLCompressedTextureS3TCsRGB.h"
 
 #include "modules/webgl/WebGLRenderingContextBase.h"
 
 namespace blink {
 
 WebGLCompressedTextureS3TCsRGB::WebGLCompressedTextureS3TCsRGB(
     WebGLRenderingContextBase* context)
     : WebGLExtension(context) {
   // TODO(kainino): update these with _EXT versions once
   // GL_EXT_compressed_texture_s3tc_srgb is ratified
   context->addCompressedTextureFormat(GL_COMPRESSED_SRGB_S3TC_DXT1_NV);
   context->addCompressedTextureFormat(GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_NV);
   context->addCompressedTextureFormat(GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_NV);
   context->addCompressedTextureFormat(GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_NV);
 }
 
-WebGLCompressedTextureS3TCsRGB::~WebGLCompressedTextureS3TCsRGB() {}
-
 WebGLExtensionName WebGLCompressedTextureS3TCsRGB::name() const {
   return WebGLCompressedTextureS3TCsRGBName;
 }
 
 WebGLCompressedTextureS3TCsRGB* WebGLCompressedTextureS3TCsRGB::create(
     WebGLRenderingContextBase* context) {
   return new WebGLCompressedTextureS3TCsRGB(context);
 }
 
 bool WebGLCompressedTextureS3TCsRGB::supported(
     WebGLRenderingContextBase* context) {
   Extensions3DUtil* extensionsUtil = context->extensionsUtil();
   return extensionsUtil->supportsExtension(
       "GL_EXT_texture_compression_s3tc_srgb");
 }
 
 const char* WebGLCompressedTextureS3TCsRGB::extensionName() {
   return "WEBGL_compressed_texture_s3tc_srgb";
 }
 
 }  // namespace blink