Remove WebGLObject maps from WebGLRenderingContextBase and WebGLContextGroup.

third_party/WebKit/Source/modules/webgl/WebGLCompressedTextureETC1.h

 // 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.
 
 #ifndef WebGLCompressedTextureETC1_h
 #define WebGLCompressedTextureETC1_h
 
 #include "modules/webgl/WebGLExtension.h"
 
 namespace blink {
 
 class WebGLCompressedTextureETC1 final : public WebGLExtension {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   static WebGLCompressedTextureETC1* create(WebGLRenderingContextBase*);
   static bool supported(WebGLRenderingContextBase*);
   static const char* extensionName();
 
-  ~WebGLCompressedTextureETC1() override;
   WebGLExtensionName name() const override;
 
  private:
   explicit WebGLCompressedTextureETC1(WebGLRenderingContextBase*);
 };
 
 }  // namespace blink
 
 #endif  // WebGLCompressedTextureETC1_h