Update file path for D-Bus files

Bug: 24194427
TEST=Build for both Brillo and Chrome OS

Change-Id: Ic2b87900b1fd8f71a0f2c0ee5d642f14cd40a7ca
diff --git a/apmanager.gyp b/apmanager.gyp
index 100f410..f3c18a8 100644
--- a/apmanager.gyp
+++ b/apmanager.gyp
@@ -75,7 +75,9 @@
       'sources': [
         'config.cc',
         'daemon.cc',
-        'dbus_control.cc',
+        'dbus/dbus_control.cc',
+        'dbus/permission_broker_dbus_proxy.cc',
+        'dbus/shill_dbus_proxy.cc',
         'device.cc',
         'device_info.cc',
         'dhcp_server.cc',
@@ -85,10 +87,8 @@
         'firewall_manager.cc',
         'hostapd_monitor.cc',
         'manager.cc',
-        'permission_broker_dbus_proxy.cc',
         'process_factory.cc',
         'service.cc',
-        'shill_dbus_proxy.cc',
         'shill_manager.cc',
       ],
     },