<inherits name="com.google.gwt.core.SynchronousFragmentLoadCallback"/>

I've spent the last week trying to isolate a GWT 2.6.0 performance regression; every method associated with a split point had an added delay of 30 ms.  We finally isolated it to this code splitting change:

http://www.gwtproject.org/release-notes.html#Release_Notes_2_6_0_RC1

• GWT.runAsync always runs asynchronously; before it would sometimes be synchronous. (This behavior can be reverted by inheriting SynchronousFragmentLoadCallback.gwt.xml)

That fixed the performance regression, but I'm concerned about this comment in the code -- is SynchronousFragmentLoadCallback going to disappear in GWT 3.0?

https://github.com/gwtproject/gwt/blob/master/user/src/com/google/gwt/core/SynchronousFragmentLoadCallback.gwt.xml

<!-- TODO(goktug): remove after 2.6 is released                             -->

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