Fix small typo in WebIDL bindings generator

R=pfeldman@chromium.org

Bug: None
Change-Id: I47ed4d0296de3430511039348bfdc3016e4e32e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1946789
Commit-Queue: Hitoshi Yoshida <peria@chromium.org>
Auto-Submit: Asanka Herath <asanka@chromium.org>
Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720704}

third_party/blink/renderer/bindings/scripts/aggregate_generated_bindings.py

@@ -59,7 +59,7 @@ from utilities import to_snake_case
 COPYRIGHT_TEMPLATE = """/*
  * THIS FILE WAS AUTOMATICALLY GENERATED, DO NOT EDIT.
  *
- * This file was generated by the action_derivedsourcesallinone.py script.
+ * This file was generated by the aggregate_generated_bindings.py script.
  *
  * Copyright (C) 2009 Google Inc.  All rights reserved.
  *