chromeos: Remove unused AP manager D-Bus client library

chromeos/dbus/dbus_thread_manager.h

Index: chromeos/dbus/dbus_thread_manager.h
diff --git a/chromeos/dbus/dbus_thread_manager.h b/chromeos/dbus/dbus_thread_manager.h
index 511afb3c4d4c562096ab0e182c0ac8b1f003317d..661df33f167e52505d41d588a5dce7303adf993c 100644
--- a/chromeos/dbus/dbus_thread_manager.h
+++ b/chromeos/dbus/dbus_thread_manager.h
@@ -26,7 +26,6 @@ class ObjectPath;
 namespace chromeos {
 
 // Style Note: Clients are sorted by names.
-class ApManagerClient;
 class ArcObbMounterClient;
 class CrasAudioClient;
 class CrosDisksClient;
@@ -108,7 +107,6 @@ class CHROMEOS_EXPORT DBusThreadManager {
 
   // All returned objects are owned by DBusThreadManager.  Do not use these
   // pointers after DBusThreadManager has been shut down.
-  ApManagerClient* GetApManagerClient();
   ArcObbMounterClient* GetArcObbMounterClient();
   CrasAudioClient* GetCrasAudioClient();
   CrosDisksClient* GetCrosDisksClient();