mojom: Remove braces from module statements and make them come first.

mojo/services/public/interfaces/native_viewport/native_viewport.mojom

Index: mojo/services/public/interfaces/native_viewport/native_viewport.mojom
diff --git a/mojo/services/public/interfaces/native_viewport/native_viewport.mojom b/mojo/services/public/interfaces/native_viewport/native_viewport.mojom
index 3d20ff41cc0592352514270cac79769ee7fbb29f..861e1ed855952a31e513b6195b8c4668425749ec 100644
--- a/mojo/services/public/interfaces/native_viewport/native_viewport.mojom
+++ b/mojo/services/public/interfaces/native_viewport/native_viewport.mojom
@@ -2,13 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+module mojo;
+
 import "mojo/services/public/interfaces/geometry/geometry.mojom";
 import "mojo/services/public/interfaces/gpu/command_buffer.mojom";
 import "mojo/services/public/interfaces/input_events/input_events.mojom";
 import "mojo/services/public/interfaces/surfaces/surface_id.mojom";
 
-module mojo {
-
 [Client=NativeViewportClient]
 interface NativeViewport {
   // TODO(sky): having a create function is awkward. Should there be a factory
@@ -32,5 +32,3 @@ interface NativeViewportClient {
   OnSizeChanged(Size size);
   OnDestroyed();
 };
-
-}