Remove mojo/tools/, not needed in chromium

mojo/tools/package_manager/BUILD.gn

Index: mojo/tools/package_manager/BUILD.gn
diff --git a/mojo/tools/package_manager/BUILD.gn b/mojo/tools/package_manager/BUILD.gn
deleted file mode 100644
index 76b5771c6bd8aeb472e6d13fb6feef3e2318e473..0000000000000000000000000000000000000000
--- a/mojo/tools/package_manager/BUILD.gn
+++ /dev/null
@@ -1,29 +0,0 @@
-# Copyright 2014 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-shared_library("package_manager") {
-  output_name = "mojo_package_manager"
-
-  sources = [
-    "manifest.cc",
-    "manifest.h",
-    "package_fetcher.cc",
-    "package_fetcher.h",
-    "package_manager.cc",
-    "package_manager_application.cc",
-    "package_manager_application.h",
-    "unpacker.cc",
-    "unpacker.h",
-  ]
-
-  deps = [
-    "//base",
-    "//mojo/application",
-    "//mojo/public/c/system:for_shared_library",
-    "//mojo/public/cpp/utility",
-    "//mojo/services/public/interfaces/network",
-    "//third_party/zlib:zip",
-    "//url",
-  ]
-}