Remove name for not exported service.

R=ppi@chromium.org, ppi

Review URL: https://codereview.chromium.org/2005803002 .

mojo/dart/packages/mojo_services/lib/mojo/native_viewport_event_dispatcher.mojom.dart

diff --git a/mojo/dart/packages/mojo_services/lib/mojo/native_viewport_event_dispatcher.mojom.dart b/mojo/dart/packages/mojo_services/lib/mojo/native_viewport_event_dispatcher.mojom.dart
index e9d94ac..3c9987e 100644
--- a/mojo/dart/packages/mojo_services/lib/mojo/native_viewport_event_dispatcher.mojom.dart
+++ b/mojo/dart/packages/mojo_services/lib/mojo/native_viewport_event_dispatcher.mojom.dart
@@ -155,7 +155,7 @@
 }
 
 abstract class NativeViewportEventDispatcher {
-  static const String serviceName = "mojo::NativeViewportEventDispatcher";
+  static const String serviceName = null;
 
   static service_describer.ServiceDescription _cachedServiceDescription;
   static service_describer.ServiceDescription get serviceDescription {

mojo/services/native_viewport/interfaces/native_viewport_event_dispatcher.mojom

diff --git a/mojo/services/native_viewport/interfaces/native_viewport_event_dispatcher.mojom b/mojo/services/native_viewport/interfaces/native_viewport_event_dispatcher.mojom
index 66533cf..394a30a 100644
--- a/mojo/services/native_viewport/interfaces/native_viewport_event_dispatcher.mojom
+++ b/mojo/services/native_viewport/interfaces/native_viewport_event_dispatcher.mojom
@@ -7,7 +7,6 @@
 
 import "input_events/interfaces/input_events.mojom";
 
-[ServiceName="mojo::NativeViewportEventDispatcher"]
 interface NativeViewportEventDispatcher {
   OnEvent(Event event) => ();
 };