idmap: Don't log spam "CREATING STRING CACHE"

Change-Id: Idce5aa5881c8e860eca9749cc85f748303c913c0
Return system theme when SecurityException is caught.

Isolated processes cannot access content resolvers so a SecurityException
will be thrown when calling getBootTheme.  This catches that
exception and returns sSystemTheme.

Change-Id: If4077adef4c657b80ba2c52a6610126dabe4ffdf
Merge "idmap: Don't log spam "CREATING STRING CACHE"" into cm-11.0
Merge branch 'cm-11.0' of git://github.com/CyanogenMod/android_frameworks_base into cd-4.4