tools: Python lint fix

Change-Id: If8a3b18004073615470eee9b8936a7fe2f171537
Reviewed-on: https://pigweed-review.googlesource.com/c/gonk/+/177170
Pigweed-Auto-Submit: Anthony DiGirolamo <tonymd@google.com>
Presubmit-Verified: CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed-service-accounts.iam.gserviceaccount.com>
Reviewed-by: Ted Pudlik <tpudlik@google.com>

tools/gonk_tools/presubmit_checks.py

diff --git a/tools/gonk_tools/presubmit_checks.py b/tools/gonk_tools/presubmit_checks.py
index 8191759..628d557 100755
--- a/tools/gonk_tools/presubmit_checks.py
+++ b/tools/gonk_tools/presubmit_checks.py
@@ -41,7 +41,6 @@
     keep_sorted,
     python_checks,
 )
-from pw_presubmit.presubmit_context import PresubmitContext, PresubmitFailure
 
 _LOG = logging.getLogger(__name__)