Simplify mojo/application/public/cpp/BUILD.gn to call the target cpp instead of application.

mojo/application/public/cpp/BUILD.gn

 # 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.
 
 import("//third_party/mojo/src/mojo/public/mojo_sdk.gni")
 
 # GYP version: mojo/mojo_base.gyp:mojo_application_base
-mojo_sdk_source_set("application") {
+mojo_sdk_source_set("cpp") {
   restrict_external_deps = false
   sources = [
     "application_connection.h",
     "application_delegate.h",
     "application_impl.h",
     "connect.h",
     "interface_factory.h",
     "interface_factory_impl.h",
     "lib/application_connection.cc",
     "lib/application_delegate.cc",
@@ skipping 19 matching lines @@
   ]
 }
 
 # GYP version: mojo/mojo_base.gyp:mojo_application_standalone
 mojo_sdk_source_set("standalone") {
   sources = [
     "lib/application_runner.cc",
   ]
 
   public_deps = [
-    ":application",
+    ":cpp",
   ]
 
   mojo_sdk_deps = [
     "mojo/public/cpp/environment:standalone",
     "mojo/public/cpp/utility",
   ]
 }
 
 mojo_sdk_source_set("test_support") {
   testonly = true
   restrict_external_deps = false
   sources = [
     "application_test_base.h",
     "lib/application_test_base.cc",
   ]
 
   deps = [
-    ":application",
+    ":cpp",
     "//mojo/application/public/interfaces",
     "//testing/gtest",
   ]
 
   mojo_sdk_deps = [
     "mojo/public/cpp/bindings",
     "mojo/public/cpp/environment",
     "mojo/public/cpp/system",
   ]
 }
 
 mojo_sdk_source_set("test_support_standalone") {
   testonly = true
   restrict_external_deps = false
   sources = [
     "lib/application_test_main.cc",
   ]
 
   public_deps = [
     ":test_support",
   ]
 
   deps = [
-    ":application",
+    ":cpp",
     "//mojo/application/public/interfaces",
   ]
 
   mojo_sdk_deps = [
     "mojo/public/cpp/environment:standalone",
     "mojo/public/cpp/system",
     "mojo/public/cpp/utility",
   ]
 }