Bug 936206: Short-circuit contact remove().
Revert "Bug 928851 - Adopt new API of enabling/disabing RIL radio"

This reverts commit 2cd2a529e5f1ab72569886998435bc46e22bf825.
Merge pull request #13488 from wanderview/contacts-fast-remove

Bug 936206: Short-circuit contact remove().  r=jmcf
Bug 928851 - Adopt new API of enabling/disabing RIL radio
Fix and update navigation tests