Update checked in version of gsutil to version 4.6

LICENSE.third_party

Index: LICENSE.third_party
===================================================================
--- LICENSE.third_party	(revision 33376)
+++ LICENSE.third_party	(working copy)
@@ -1,16 +0,0 @@
-GOOGLE APP ENGINE SDK
-**************************************************************************
-Copyright 2008 Google Inc.
-All rights reserved.
-
-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.