Allow immediate removal of a wait fragment.

Another variant of the problem, where adding a wait fragment and
immediately removing it (all in handleIntent) doesn't work because
getFragmentByTag() fails.

Bug: 7377741 Waiting for sync didn't dismiss when attempting to view
             conversation

Change-Id: I5536cb692dfb57bf998c0f01b34e42fe3118789c
3 files changed