Remove unnecessary WebGLRenderingContextBase unregistration.

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

 /*
  * Copyright (C) 2009 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 187 matching lines @@
     forciblyEvictedContexts().set(context, generation++);
 }
 
 void WebGLRenderingContextBase::removeFromEvictedList(WebGLRenderingContextBase* context)
 {
     forciblyEvictedContexts().remove(context);
 }
 
 void WebGLRenderingContextBase::willDestroyContext(WebGLRenderingContextBase* context)
 {
+#if ENABLE(OILPAN)
+    // These two sets keep weak references to their contexts;
+    // verify that the GC already removed the |context| entries.
+    ASSERT(!forciblyEvictedContexts().contains(context));
+    ASSERT(!activeContexts().contains(context));
+#else
     removeFromEvictedList(context);
     deactivateContext(context);
+#endif
 
     // Try to re-enable the oldest inactive contexts.
     while (activeContexts().size() < maxGLActiveContexts && forciblyEvictedContexts().size()) {
         WebGLRenderingContextBase* evictedContext = oldestEvictedContext();
         if (!evictedContext->m_restoreAllowed) {
             forciblyEvictedContexts().remove(evictedContext);
             continue;
         }
 
         IntSize desiredSize = DrawingBuffer::adjustSize(evictedContext->clampedCanvasSize(), IntSize(), evictedContext->m_maxTextureSize);
@@ skipping 6068 matching lines @@
         webContext()->pixelStorei(GL_UNPACK_ALIGNMENT, 1);
 }
 
 void WebGLRenderingContextBase::restoreUnpackParameters()
 {
     if (m_unpackAlignment != 1)
         webContext()->pixelStorei(GL_UNPACK_ALIGNMENT, m_unpackAlignment);
 }
 
 } // namespace blink