This bug is an offshoot of work done for 4455106 and 4327621
(SwingBasher crashes due to out of memory).

> Leak in WmImeComposition (and in WmImeCompositionW as well) seems to
> be owned by IM. Also, there are other leaks in those methods
> (jsResultStrW, for example). I think that that leak is better
> re-filed as a separate bug in classes_im.

awt_Component.cpp

MsgRouting AwtComponent::WmImeComposition(WORD wChar, long flags)
{
...
    jstring jsMergedStrW =
         (jstring)JNU_CallMethodByName(env, NULL, jsResultStrW,
         "concat",
                "(Ljava/lang/String;)Ljava/lang/String;",
         jsCompStrW).l;

is not removed.