Changes html_viewer to get services from appropriate application

components/html_viewer/setup.h

Index: components/html_viewer/setup.h
diff --git a/components/html_viewer/setup.h b/components/html_viewer/setup.h
index 07e54d386ba31e02d090c01600c68fcff9ae9b37..ed3255466d44c201d36613397c20890d48c851c1 100644
--- a/components/html_viewer/setup.h
+++ b/components/html_viewer/setup.h
@@ -49,7 +49,6 @@ class Setup {
   void InitIfNecessary(const gfx::Size& screen_size_in_pixels,
                        float device_pixel_ratio);
 
-  mojo::ApplicationImpl* app() const { return app_; }
   bool is_headless() const { return is_headless_; }
   bool did_init() const { return did_init_; }
 
@@ -66,6 +65,9 @@ class Setup {
   MediaFactory* media_factory() { return media_factory_.get(); }
 
  private:
+  // App for HTMLViewer, not the document's app.
+  // WARNING: do not expose this. It's too easy to use the wrong one.
+  // HTMLDocument should be using the application it creates, not this one.
   mojo::ApplicationImpl* app_;
 
   resource_provider::ResourceLoader resource_loader_;