CM11 Themes: Use sendBroadcastAsUser in ThemeService

Change-Id: I2a283318357ece9f6195a9bb825748b4549396af
Merge "CM11 Themes: Use sendBroadcastAsUser in ThemeService" into cm-11.0
Merge commit '7885093143f90f45751a593625a41376e3aa1283' into android-4.4