Provide the DeviceManager service to the renderer directly, no app.

device/devices_app/usb/device_manager_impl_unittest.cc

Index: device/devices_app/usb/device_manager_impl_unittest.cc
diff --git a/device/devices_app/usb/device_manager_impl_unittest.cc b/device/devices_app/usb/device_manager_impl_unittest.cc
index d4e43c882b052fc4bfadb25c51825a592e8bd7fe..ca7e0bdf1763040445340ecc194e5f3f94f31cfb 100644
--- a/device/devices_app/usb/device_manager_impl_unittest.cc
+++ b/device/devices_app/usb/device_manager_impl_unittest.cc
@@ -58,9 +58,8 @@ class USBDeviceManagerImplTest : public testing::Test {
     PermissionProviderPtr permission_provider;
     permission_provider_.Bind(mojo::GetProxy(&permission_provider));
     DeviceManagerPtr device_manager;
-    new DeviceManagerImpl(mojo::GetProxy(&device_manager),
-                          permission_provider.Pass(),
-                          base::ThreadTaskRunnerHandle::Get());
+    DeviceManagerImpl::Create(permission_provider.Pass(),
+                              mojo::GetProxy(&device_manager));
     return device_manager.Pass();
   }