Moving check_package_boundaries to the presubmit checks directory

tools_webrtc/testdata/all_build_files/BUILD.gn

Index: tools_webrtc/testdata/all_build_files/BUILD.gn
diff --git a/tools_webrtc/testdata/all_build_files/BUILD.gn b/tools_webrtc/testdata/all_build_files/BUILD.gn
deleted file mode 100644
index 46bd2bec8f41c7b1d68075999db0c8aacb0b95a6..0000000000000000000000000000000000000000
--- a/tools_webrtc/testdata/all_build_files/BUILD.gn
+++ /dev/null
@@ -1,14 +0,0 @@
-# Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
-#
-# Use of this source code is governed by a BSD-style license
-# that can be found in the LICENSE file in the root of the source
-# tree. An additional intellectual property rights grant can be found
-# in the file PATENTS.  All contributing project authors may
-# be found in the AUTHORS file in the root of the source tree.
-
-target("dummy_target_ok") {
-  sources = [
-    "dummy_source.cc",
-    "dummy_source.h",
-  ]
-}