[webapi][xwalk-1862] Update the tizen device API test suites which relying on /opt/usr/media to $home/content

  Unit test Platform: Tizen IVI
  Unit test result: verified, all suites work fine
Merge pull request #400 from Honry/Honry/xwalk-1862

[webapi][xwalk-1862] Update the tizen device API test suites which relyi...