Revert of MediaPerceptionPrivate API impl and testing.

chromeos/dbus/dbus_thread_manager.cc

Index: chromeos/dbus/dbus_thread_manager.cc
diff --git a/chromeos/dbus/dbus_thread_manager.cc b/chromeos/dbus/dbus_thread_manager.cc
index e25de684f1532dd7182316be7595b554134c9ffe..8f672874c487ed621ea2397677d22af6fb2caba5 100644
--- a/chromeos/dbus/dbus_thread_manager.cc
+++ b/chromeos/dbus/dbus_thread_manager.cc
@@ -41,7 +41,6 @@
 #include "chromeos/dbus/sms_client.h"
 #include "chromeos/dbus/system_clock_client.h"
 #include "chromeos/dbus/update_engine_client.h"
-#include "chromeos/dbus/upstart_client.h"
 #include "dbus/bus.h"
 #include "dbus/dbus_statistics.h"
 
@@ -417,10 +416,4 @@
       std::move(client);
 }
 
-void DBusThreadManagerSetter::SetUpstartClient(
-    std::unique_ptr<UpstartClient> client) {
-  DBusThreadManager::Get()->clients_browser_->upstart_client_ =
-      std::move(client);
-}
-
 }  // namespace chromeos