Remove DEFAULT_THEME_APPLIED_ON_FIRST_BOOT

doApplyDefaultTheme should be able to apply the default theme, if
one exists, whenever applyDefaultTheme() is called.

Change-Id: Ia50b4089d122855a4ddde91a02eef33ed3f9eaf4

Conflicts:
	core/java/android/provider/Settings.java
Add status bar and navigation bar to ThemesContract

Change-Id: I8048c735d7bbbfdb86ee5923b95bece6b4252bf7
Add previews to the themes contract.

Change-Id: I607a6eda1c63a701516d2bc78ca6b705841fbdf7
Revert "Vpn: Setup routes."

This reverts commit 93f9ebe47437d71bf66c8999f7cffc973f5959ed. It
is incompatible with change I5b2bde0ac5459433fc5749f509072a548532f730
and breaks routing on 4.4.3

Change-Id: I6e730ae66c7a5fdca582cc8c05f13ea8b234d848