Move shell interfaces into the shell.mojom namespace.

mojo/shell/runner/child/child_controller.mojom

Index: mojo/shell/runner/child/child_controller.mojom
diff --git a/mojo/shell/runner/child/child_controller.mojom b/mojo/shell/runner/child/child_controller.mojom
index 2c56357e401049254dfd9576651f31799a1e259f..34c6dc9473196693e5cd31d2b7548b15f3898067 100644
--- a/mojo/shell/runner/child/child_controller.mojom
+++ b/mojo/shell/runner/child/child_controller.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.shell;
+module mojo.shell.mojom;
 
 import "mojo/shell/public/interfaces/application.mojom";
 
 interface ChildController {
   // Starts the app.
-  StartApp(mojo.Application& application_request) => (int32 result);
+  StartApp(Application& application_request) => (int32 result);
 
   // Exits the child process now (with no cleanup), with the given exit code.
   ExitNow(int32 exit_code);