Remove WebGLObject maps from WebGLRenderingContextBase and WebGLContextGroup.

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

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 20 matching lines @@
 
 WebGLCompressedTexturePVRTC::WebGLCompressedTexturePVRTC(
     WebGLRenderingContextBase* context)
     : WebGLExtension(context) {
   context->addCompressedTextureFormat(GL_COMPRESSED_RGB_PVRTC_4BPPV1_IMG);
   context->addCompressedTextureFormat(GL_COMPRESSED_RGB_PVRTC_2BPPV1_IMG);
   context->addCompressedTextureFormat(GL_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG);
   context->addCompressedTextureFormat(GL_COMPRESSED_RGBA_PVRTC_2BPPV1_IMG);
 }
 
-WebGLCompressedTexturePVRTC::~WebGLCompressedTexturePVRTC() {}
-
 WebGLExtensionName WebGLCompressedTexturePVRTC::name() const {
   return WebGLCompressedTexturePVRTCName;
 }
 
 WebGLCompressedTexturePVRTC* WebGLCompressedTexturePVRTC::create(
     WebGLRenderingContextBase* context) {
   return new WebGLCompressedTexturePVRTC(context);
 }
 
 bool WebGLCompressedTexturePVRTC::supported(
     WebGLRenderingContextBase* context) {
   return context->extensionsUtil()->supportsExtension(
       "GL_IMG_texture_compression_pvrtc");
 }
 
 const char* WebGLCompressedTexturePVRTC::extensionName() {
   return "WEBGL_compressed_texture_pvrtc";
 }
 
 }  // namespace blink