Addressed haraken's feedback on the removal of WebGLObject maps.

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

 /*
  * Copyright (C) 2011 Apple 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 29 matching lines @@
   // eagerly during context loss. The invalidation is discovered lazily.
   return contextGroup == m_contextGroup &&
          cachedNumberOfContextLosses() == contextGroup->numberOfContextLosses();
 }
 
 uint32_t WebGLSharedObject::currentNumberOfContextLosses() const {
   return m_contextGroup->numberOfContextLosses();
 }
 
 gpu::gles2::GLES2Interface* WebGLSharedObject::getAGLInterface() const {
-  return m_contextGroup ? m_contextGroup->getAGLInterface() : nullptr;
+  return m_contextGroup->getAGLInterface();
 }
 
 DEFINE_TRACE(WebGLSharedObject) {
   visitor->trace(m_contextGroup);
   WebGLObject::trace(visitor);
 }
 
 DEFINE_TRACE_WRAPPERS(WebGLSharedObject) {
   visitor->traceWrappers(m_contextGroup);
   WebGLObject::traceWrappers(visitor);
 }
 
 }  // namespace blink