[Android][Extension] Use native Promise in Javascript

Some old extensions are still using requireNative('sysapps_promise').
This commit is to replace them with the Javacript build-in Promise.

BUG=https://crosswalk-project.org/jira/browse/XWALK-1678
Merge pull request #2196 from deqing/promise

[Android][Extension] Use native Promise in Javascript