Cleaning up remoting GN build files. Condense the sources.

remoting/host/setup/BUILD.gn

 # Copyright 2015 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("//remoting/remoting_srcs.gni")
-
 source_set("setup") {
-  sources =
-      rebase_path(remoting_host_srcs_gypi_values.remoting_host_setup_sources,
-                  ".",
-                  "//remoting")
+  sources = [
+    "daemon_controller.cc",
+    "daemon_controller.h",
+    "daemon_controller_delegate_linux.cc",
+    "daemon_controller_delegate_linux.h",
+    "daemon_controller_delegate_mac.h",
+    "daemon_controller_delegate_mac.mm",
+    "daemon_controller_delegate_win.cc",
+    "daemon_controller_delegate_win.h",
+    "gaia_oauth_client.cc",
+    "gaia_oauth_client.h",
+    "me2me_native_messaging_host.cc",
+    "me2me_native_messaging_host.h",
+    "oauth_client.h",
+    "oauth_helper.cc",
+    "oauth_helper.h",
+    "pin_validator.cc",
+    "pin_validator.h",
+    "service_client.cc",
+    "service_client.h",
+    "test_util.cc",
+    "test_util.h",
+    "win/auth_code_getter.cc",
+    "win/auth_code_getter.h",
+  ]
 
   configs += [
     # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     "//build/config/compiler:no_size_t_to_int_warning",
     "//build/config/compiler:wexit_time_destructors",
     "//remoting:version",
   ]
 
   deps = [
     "//base",
     "//google_apis",
     "//remoting/host",
     "//remoting/host/native_messaging",
   ]
 
   if (is_win) {
     deps += [ "//remoting/host:remoting_lib_idl" ]
   }
 }