Revert of [Oilpan] Migrate classes under module/webgl onto oilpan heap

Source/modules/webgl/WebGLRenderbuffer.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 13 matching lines @@
  */
 
 #include "config.h"
 
 #include "modules/webgl/WebGLRenderbuffer.h"
 
 #include "modules/webgl/WebGLRenderingContextBase.h"
 
 namespace blink {
 
-WebGLRenderbuffer* WebGLRenderbuffer::create(WebGLRenderingContextBase* ctx)
+PassRefPtrWillBeRawPtr<WebGLRenderbuffer> WebGLRenderbuffer::create(WebGLRenderingContextBase* ctx)
 {
-    return new WebGLRenderbuffer(ctx);
+    return adoptRefWillBeNoop(new WebGLRenderbuffer(ctx));
 }
 
 WebGLRenderbuffer::~WebGLRenderbuffer()
 {
+#if ENABLE(OILPAN)
     // This render buffer (heap) object must finalize itself.
     m_emulatedStencilBuffer.clear();
-
-    // See the comment in WebGLObject::detachAndDeleteObject().
+#endif
+    // Always call detach here to ensure that platform object deletion
+    // happens with Oilpan enabled. It keeps the code regular to do it
+    // with or without Oilpan enabled.
+    //
+    // See comment in WebGLBuffer's destructor for additional
+    // information on why this is done for WebGLSharedObject-derived
+    // objects.
     detachAndDeleteObject();
 }
 
 WebGLRenderbuffer::WebGLRenderbuffer(WebGLRenderingContextBase* ctx)
     : WebGLSharedPlatform3DObject(ctx)
     , m_internalFormat(GL_RGBA4)
     , m_width(0)
     , m_height(0)
     , m_hasEverBeenBound(false)
 {
@@ skipping 15 matching lines @@
     m_emulatedStencilBuffer.clear();
 }
 
 DEFINE_TRACE(WebGLRenderbuffer)
 {
     visitor->trace(m_emulatedStencilBuffer);
     WebGLSharedPlatform3DObject::trace(visitor);
 }
 
 } // namespace blink