[webapi][XWALK-522] Update 2 TCs for webapi-promises-nonw3c-tests

Impacted TCs num(approved): New 0 Update 2 Delete 0
Unit test Platform: Android
Unit test result summary: Pass 0, Fail 2, Block 0
Comments：
Promise callback is not called，but promise is fulfilled.
For one thing, this `callFlag` is different from common sense (if a function called this flag true);

for another, why not automate this test as it just check whether a promise task is executed.