Remove WebGLObject maps from WebGLRenderingContextBase and WebGLContextGroup.

third_party/WebKit/Source/modules/webgl/WebGLSharedPlatform3DObject.cpp

 // Copyright 2015 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/WebGLSharedPlatform3DObject.h"
 
 #include "modules/webgl/WebGLRenderingContextBase.h"
 
 namespace blink {
 
 WebGLSharedPlatform3DObject::WebGLSharedPlatform3DObject(
     WebGLRenderingContextBase* ctx)
     : WebGLSharedObject(ctx), m_object(0) {}
 
-WebGLSharedPlatform3DObject::~WebGLSharedPlatform3DObject() {}
-
 void WebGLSharedPlatform3DObject::setObject(GLuint object) {
   // object==0 && deleted==false indicating an uninitialized state;
   ASSERT(!m_object && !isDeleted());
   m_object = object;
 }
 
 bool WebGLSharedPlatform3DObject::hasObject() const {
   return m_object != 0;
 }
 
 }  // namespace blink