use IGNORE_EINTR w/close

HANDLE_EINTR is both not safe and not useful on Linux systems.
Switch to IGNORE_EINTR like Chromium has done everywhere.

See http://crbug.com/269623 for details.

BUG=chromium:373154
TEST=`cbuildbot {arm,amd64,x86}-generic-full` passes

Change-Id: Ib7b5c6913a63cc391005e9814200b87ed7ed7733
Reviewed-on: https://chromium-review.googlesource.com/199850
Reviewed-by: Ben Chan <benchan@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>