gn_helper: add missing sys import

A recent change added sys usage without the corresponding import. Add it.
See https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/6217699

Bug: 393209409
Change-Id: Ib30dc8938ec6e3b56ab35a7b5e2b2071cb9e84ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/6300492
Auto-Submit: Tomasz Śniatowski <tomasz.sniatowski@xperi.com>
Commit-Queue: Fumitoshi Ukai <ukai@google.com>
Reviewed-by: Philipp Wollermann <philwo@google.com>
Reviewed-by: Fumitoshi Ukai <ukai@google.com>
changes/92/6300492/3
Tomasz Śniatowski 2 days ago committed by LUCI CQ
parent a60883e901
commit 823adab6bd

@ -5,6 +5,7 @@
import os
import re
import sys
def _find_root(output_dir):

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