[webapi] Update cases due to spec update for chromium38

- New spec:https://dvcs.w3.org/hg/dap/raw-file/default/battery/Overview.html

Impacted tests(approved): new 9, update 0, delete 24
Unit test platform: [Android][IVI]
Unit test summary: pass 9, fail 0, block 0
Please don't touch the copyright year.