[sample] Update sreen orientation sample to reflect Chromium 38 implementation

However, the sample fails on my ZTE with canary 9.38.199.0
The layout shall be restored as before.

BUG=https://crosswalk-project.org/jira/browse/XWALK-2372
Merge pull request #853 from zqzhang/XWALK-2372

[sample] Update sreen orientation sample to reflect Chromium 38 implemen...