[XWALK-1293] Remove a removeStorageStateChangeListener test of fileSystemManager

-Can not change storage state by JS
-The storageStateChange event can not be fired

Signed-off-by: xiaojunwu <xiaojunx.a.wu@intel.com>
Merge pull request #966 from xiaojunwu/xiaojunwu/filesystem-removeStroageStateChangeListener

[XWALK-1293] Remove a removeStorageStateChangeListener test of fileSyste...