gestures: Remove gflags dependency

With our minimization efforts we are removing gflags dependencies from
the codebase.  Convert gestures to using getopt.h rather than
chromeos/flag_helper.h so that it can more easily target other distros
besides ChromeOS.

BUG=chromium:424774
TEST=`FEATURES=test emerge-daisy gestures`

Change-Id: Ia312af4cefcd22a21f6e3d04e3be080ae748ac03
Reviewed-on: https://chromium-review.googlesource.com/224166
Reviewed-by: Andrew de los Reyes <adlr@chromium.org>
Tested-by: Steve Fung <stevefung@chromium.org>
Commit-Queue: Steve Fung <stevefung@chromium.org>
2 files changed