[Android] Fix the issue about onJavascriptModalDialog was not called.

This patch is to fix the issue about onJavascriptModalDialog was not called
when this function was overridden in class of XWalkUIClient.
Modify the condition for override function, if parameter is not the
instance of specified, create a new instance.

BUG=XWALK-2534
You mean ```GetFormattedParamArray``` should return ```[view instance of XWalkViewBridge]``` but not ```[view instanceof XWalkViewBridge, result instanceof XWalkJavascriptResultHandlerBridge]```?