Eliminate MojoApplicationHost

content/renderer/mus/render_widget_mus_connection.cc

Index: content/renderer/mus/render_widget_mus_connection.cc
diff --git a/content/renderer/mus/render_widget_mus_connection.cc b/content/renderer/mus/render_widget_mus_connection.cc
index e146893e43e16fde309afd1d42f74f78162d6b80..713b7c98cc75cff8bdd8b3d5d8b2e8cc1f45b222 100644
--- a/content/renderer/mus/render_widget_mus_connection.cc
+++ b/content/renderer/mus/render_widget_mus_connection.cc
@@ -14,6 +14,7 @@
 #include "components/mus/public/interfaces/command_buffer.mojom.h"
 #include "components/mus/public/interfaces/surface.mojom.h"
 #include "components/mus/public/interfaces/window_tree.mojom.h"
+#include "content/public/child/child_thread.h"
 #include "content/public/common/mojo_shell_connection.h"
 #include "content/renderer/mus/compositor_mus_connection.h"
 #include "content/renderer/render_thread_impl.h"
@@ -48,7 +49,7 @@ RenderWidgetMusConnection::CreateOutputSurface() {
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(!window_surface_binding_);
   scoped_refptr<cc::ContextProvider> context_provider(new mus::ContextProvider(
-      MojoShellConnection::GetForProcess()->GetConnector()));
+      ChildThread::Get()->GetMojoShellConnection()->GetConnector()));
 
   std::unique_ptr<cc::OutputSurface> surface(new mus::OutputSurface(
       context_provider, mus::WindowSurface::Create(&window_surface_binding_)));