Made DB ignoreErrors() method protected

Made DB ignoreErrors() method protected

* This should *only* ever be used internal for error suppression,
  such as in the exception reporting methods. Having it public
  means callers have to worry (in theory) about whether the
  DB handles errors one way or a totally different way even
  though there is really only meant to be one.

Change-Id: I5916830d1bd53ee948308f394e55c17dd515ad33