[Alarm] Fix failures raised from test suite.

I've downloaded the test suite from http://otcqa.sh.intel.com/qa-auto/live/Web_TCT_Xwalk/ and run them manually.
All the alarm related failures in the test suite have been fixed.

BUG=XWALK-2163
Just realized that `ret.error` means the alarm has expired here. Your code make sense here.

Maybe we need a console warning log to indicate the alarm has expired?