No bug - Part 1: Avoid warning messages when landing res/values*.

This also asserts that the android-sync repository owns sync_* and
fxaccount_* in mobile/android/base/resources/values*; that is, files not
managed by the android-sync repository that match the glob will be
deleted.
No bug - Part 2: Make android-sync own its source directories in mozilla-central.

That is, files not managed by the android-sync repository that match the
source files glob will be deleted.  Remember to use |hg addremove| to
commit added and removed files to mozilla-central!