Eliminate MojoApplicationHost

content/renderer/mus/render_widget_window_tree_client_factory.cc

Index: content/renderer/mus/render_widget_window_tree_client_factory.cc
diff --git a/content/renderer/mus/render_widget_window_tree_client_factory.cc b/content/renderer/mus/render_widget_window_tree_client_factory.cc
index dd862b0e8f00b415127e34f56c5a74bfa0c3e59b..717f587db0fdb1a34af3cc000a1884f3f5385e1a 100644
--- a/content/renderer/mus/render_widget_window_tree_client_factory.cc
+++ b/content/renderer/mus/render_widget_window_tree_client_factory.cc
@@ -11,6 +11,7 @@
 #include "base/memory/ptr_util.h"
 #include "components/mus/public/interfaces/window_tree.mojom.h"
 #include "content/common/render_widget_window_tree_client_factory.mojom.h"
+#include "content/public/child/child_thread.h"
 #include "content/public/common/mojo_shell_connection.h"
 #include "content/renderer/mus/render_widget_mus_connection.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
@@ -32,7 +33,7 @@ class RenderWidgetWindowTreeClientFactoryImpl
       public mojom::RenderWidgetWindowTreeClientFactory {
  public:
   RenderWidgetWindowTreeClientFactoryImpl() {
-    DCHECK(MojoShellConnection::GetForProcess());
+    DCHECK(ChildThread::Get()->GetMojoShellConnection());
   }
 
   ~RenderWidgetWindowTreeClientFactoryImpl() override {}
@@ -68,7 +69,7 @@ class RenderWidgetWindowTreeClientFactoryImpl
 }  // namespace
 
 void CreateRenderWidgetWindowTreeClientFactory() {
-  MojoShellConnection::GetForProcess()->AddEmbeddedShellClient(
+  ChildThread::Get()->GetMojoShellConnection()->AddEmbeddedShellClient(
       base::WrapUnique(new RenderWidgetWindowTreeClientFactoryImpl));
 }