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

Source/modules/webgl/WebGLFenceSync.h

 // 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.
 
 #ifndef WebGLFenceSync_h
 #define WebGLFenceSync_h
 
 #include "modules/webgl/WebGLSync.h"
+#include "wtf/PassRefPtr.h"
 
 namespace blink {
 
 class WebGL2RenderingContextBase;
 
 class WebGLFenceSync : public WebGLSync {
 public:
     ~WebGLFenceSync() override;
 
-    static WebGLSync* create(WebGL2RenderingContextBase*, GLenum condition, GLbitfield flags);
+    static PassRefPtrWillBeRawPtr<WebGLSync> create(WebGL2RenderingContextBase*, GLenum condition, GLbitfield flags);
 
 protected:
     WebGLFenceSync(WebGL2RenderingContextBase*, GLenum condition, GLbitfield flags);
 };
 
 } // namespace blink
 
 #endif // WebGLFenceSync_h