Rename mojo_application GN templates to service*

mojo/public/mojo_constants.gni

Index: mojo/public/mojo_constants.gni
diff --git a/mojo/public/mojo_constants.gni b/mojo/public/mojo_constants.gni
deleted file mode 100644
index 3165a8dc9e2b7d223b1b3e2e9fe25ac30bd1c390..0000000000000000000000000000000000000000
--- a/mojo/public/mojo_constants.gni
+++ /dev/null
@@ -1,8 +0,0 @@
-# Copyright 2016 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.
-
-declare_args() {
-  # Mojo application directories are created within this subdirectory.
-  mojo_application_subdir = "Mojo Applications"
-}