third_party/ninja: Fix license header

It should have used the Crashpad license header boilerplate when it
was added.

Change-Id: Ifb84e989b6f32ad3c5c8fb096a4931844ddadccc
Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/6472729
Reviewed-by: Mark Mentovai <mark@chromium.org>
Reviewed-by: Leonard Grey <lgrey@chromium.org>
diff --git a/third_party/ninja/ninja b/third_party/ninja/ninja
index 402ab2a..ca08746 100755
--- a/third_party/ninja/ninja
+++ b/third_party/ninja/ninja
@@ -1,8 +1,18 @@
 #!/bin/sh
 
-# Copyright 2022 Google Inc. All rights reserved
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
+# Copyright 2022 The Crashpad Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
 
 set -eu