dbus: Replace PostTaskTo*Thread methods with Get*TaskRunner

device/media_transfer_protocol/media_transfer_protocol_manager.cc

Index: device/media_transfer_protocol/media_transfer_protocol_manager.cc
diff --git a/device/media_transfer_protocol/media_transfer_protocol_manager.cc b/device/media_transfer_protocol/media_transfer_protocol_manager.cc
index 9bcf5be28ace725bcbe0abb31d91bbba80fcec09..6c0210af1e0613f64439b24237f424642671f8dc 100644
--- a/device/media_transfer_protocol/media_transfer_protocol_manager.cc
+++ b/device/media_transfer_protocol/media_transfer_protocol_manager.cc
@@ -69,8 +69,8 @@ class MediaTransferProtocolManagerImpl : public MediaTransferProtocolManager {
                                             mtpd_owner_changed_callback_);
 
 #if !defined(OS_CHROMEOS)
-      session_bus_->PostTaskToDBusThread(
-          FROM_HERE, base::Bind(&dbus::Bus::ShutdownAndBlock, session_bus_));
+    session_bus_->GetDBusTaskRunner()->PostTask(
+        FROM_HERE, base::Bind(&dbus::Bus::ShutdownAndBlock, session_bus_));
 #endif
 
     VLOG(1) << "MediaTransferProtocolManager Shutdown completed";