pre-upload: ignore generated Go protobuf bindings

BUG=chromium:989573
TEST=unittests pass

Change-Id: I3b0e43b71641c369390238d365fb88e1adb192d2
Reviewed-on: https://chromium-review.googlesource.com/1729627
Tested-by: Mike Frysinger <vapier@chromium.org>
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Reviewed-by: Alex Klein <saklein@chromium.org>
diff --git a/pre-upload.py b/pre-upload.py
index ed69623..9a842c8 100755
--- a/pre-upload.py
+++ b/pre-upload.py
@@ -86,8 +86,9 @@
     # Ignore license files as the content is often taken verbatim.
     r".*/licenses/.*",
 
-    # Exclude generated python protobuf files.
+    # Exclude generated protobuf bindings.
     r".*_pb2\.py$",
+    r".*\.pb\.go$",
 ]
 
 LICENSE_EXCLUDED_PATHS = [