[misc-xwalk] Integrate tests of NavigatorLanguage.

-Fail Reason: Cannot read property 'setAcceptLanguages' of undefined at Object

Impacted tests(approved): New 1, Update 0, Delete 0
Unit test platform: [Android]
Unit test result summary: Pass 0, Fail 1, Block 0
Oh, no. Please copy the https://github.com/crosswalk-project/blink-crosswalk/blob/master/LayoutTests/navigator_language/navigator_language.html directly. 

For the `navigator_language.html`, you need only to update the reference path to `testharness*` files.