Move runner stuff into a runner namespace.

mojo/shell/native_runner.h

Index: mojo/shell/native_runner.h
diff --git a/mojo/shell/native_runner.h b/mojo/shell/native_runner.h
index cc2ffb883cc96364aef7061b4e42796e06b039ba..b98cb82e2d462c48b9c563350237b6d574a9f129 100644
--- a/mojo/shell/native_runner.h
+++ b/mojo/shell/native_runner.h
@@ -9,7 +9,6 @@
 #include "base/memory/scoped_ptr.h"
 #include "mojo/public/cpp/bindings/interface_request.h"
 #include "mojo/public/interfaces/application/application.mojom.h"
-#include "mojo/runner/native_application_support.h"
 
 namespace base {
 class FilePath;
@@ -18,6 +17,8 @@ class FilePath;
 namespace mojo {
 namespace shell {
 
+enum class NativeApplicationCleanup { DELETE, DONT_DELETE };
+
 // ApplicationManager requires implementations of NativeRunner and
 // NativeRunnerFactory to run native applications.
 class NativeRunner {