libchrome: Delete preg_parser.cc from libchrome at HEAD, not as a patch

See CL:1016763 which patches the current ebuild version of libchrome to
delete preg_parser, and moves it into authpolicy. This is because
preg_parser is no longer used by chrome or libchrome, authpolicy is the
only remaining user. So this CL makes the same change at HEAD so that
the delete_preg_parser.patch will no longer be needed once libchrome
is upreved to include this CL.

BUG=chromium:832044
TEST=Build libchrome and inspect it to see it doesn't have preg_parser any more.

Change-Id: I7727965f34fd96688837fbcdcccbf59e1f76d69e
Reviewed-on: https://chromium-review.googlesource.com/1023990
Commit-Ready: A Olsen <olsen@chromium.org>
Tested-by: A Olsen <olsen@chromium.org>
Reviewed-by: Lutz Justen <ljusten@chromium.org>
4 files changed