Expanded Desktop : Fix Left handed navbar during landscape mode

from http://review.cyanogenmod.org/#/c/57454
when you enable expanded desktop and left handed navbar.
you need to swipe from right edge to show navbar.
but this patch will change to swipe from left edge to show navbar.
Video avalible at http://youtu.be/rUy14LQj9iE

Patchset2 : change tab to whitespace
Patchset3 : remove \r after @override in PhoneWindowManager.java
Patchset4 : Update commit message
Patchset5 : Address code formating comments
Patchset6 : Whitespace

Change-Id: I65a15c6f5e662e429a818484de6b71e81c7ae713