Enable Config::MUS to use classic IME instead of servicified IME.

ash/mus/ash_window_tree_host_mus.h

Index: ash/mus/ash_window_tree_host_mus.h
diff --git a/ash/mus/ash_window_tree_host_mus.h b/ash/mus/ash_window_tree_host_mus.h
index 03056b54d15ebeac603b110b9f15a701f31c3105..41d5f010d5bd0503e2bf0d1de7dde03403090182 100644
--- a/ash/mus/ash_window_tree_host_mus.h
+++ b/ash/mus/ash_window_tree_host_mus.h
@@ -37,6 +37,10 @@ class AshWindowTreeHostMus : public AshWindowTreeHost,
   void UpdateRootWindowSizeInPixels(
       const gfx::Size& host_size_in_pixels) override;
 
+  // ui::internal::InputMethodDelegate:

[sky, 2017/05/04 03:09:18]

As this override comes through via AshWindowTreeHostMus prefixing the override
with InputMethodDelegate is confusing. Please group with the other
WindowTreeHostMus overrides to make it clear where the overrides comes from.

[Hadi, 2017/05/04 12:15:17]

Done.

+  ui::EventDispatchDetails DispatchKeyEventPostIME(
+      ui::KeyEvent* event) override;
+
  private:
   std::unique_ptr<TransformerHelper> transformer_helper_;