Does not replace navigator.presentation

Cordova does not call navigator.presentation explicitly, but
replaceNavigator() will try to access all members belong to navigator.
This will trigger navigator.presentation instance be created.

There is race condition that cause sometimes XWalkExtensionServer
is not instanlized before navigator.presentation is accessed in web
page.

This crash does not happen when loadUrl is called onece, but worse and
worse when loadUrl calling times increased. That is why manually test
does not meet crash while instrumentation test will.

Temporaly, we bypass presentation API to avoid crashing. Long term, we
should fix the issue inside the C++ code, eg: XWalkExtensionServer.cc

BUG=https://crosswalk-project.org/jira/browse/XWALK-1688