Handle a BOM when converting PAC file to UTF16.

Bug: 891526
Change-Id: I3ecda33cc7c1dbc2df96a613c5723a77ead9806c
Reviewed-on: https://chromium-review.googlesource.com/c/1258505
Reviewed-by: Matt Mueller <mattm@chromium.org>
Commit-Queue: Eric Roman <eroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599060}
4 files changed