Fix bug with replacements in translateOffset()

In our test case, offset 12 was mapped to 16, but that should be 11.
The problem here was that the offset right before the removal was
mapped to right after the removal, but that's only valid if we're
dealing with a removal, not when we're dealing with a replacement
where we're both removing and inserting data.

Change-Id: Ibf3c1463c0de009578cd50736f19bae82669ced8
Merge "Fix bug with replacements in translateOffset()"