Set slide animation by default and use it in all pages.
Fix wrong/missing slide animations on various transitions like WiFi
and the backup subpage.
Change-Id: I78c87f38eb615379d39c89b43a016ed2ffb98695
* Remove unused imports
* Fix a few line length issues
* Convert a few anonymous classes to lambda expressions
* Convert a few global vars to locals
* Remove unused methods
* Add a small local method in MobileDataActivity to shorten repeated calls
Change-Id: Ia10be8b8c98ef3956949f913ddb6bddc185cf1a5
