ui + mus: Split ContextFactory into ContextFactory(Client) and ContextFactoryPrivate

ui/views_content_client/views_content_client_main_parts.cc

Index: ui/views_content_client/views_content_client_main_parts.cc
diff --git a/ui/views_content_client/views_content_client_main_parts.cc b/ui/views_content_client/views_content_client_main_parts.cc
index d6e4626eb5c61f450a032609a0a005300500281d..3f789391eafedc6bdd834b31d5239f28d8d3d96b 100644
--- a/ui/views_content_client/views_content_client_main_parts.cc
+++ b/ui/views_content_client/views_content_client_main_parts.cc
@@ -32,6 +32,8 @@ void ViewsContentClientMainParts::PreMainMessageLoopRun() {
   std::unique_ptr<views::TestViewsDelegate> test_views_delegate(
       new views::DesktopTestViewsDelegate);
   test_views_delegate->set_context_factory(content::GetContextFactory());
+  test_views_delegate->set_context_factory_private(
+      content::GetContextFactoryPrivate());
   views_delegate_ = std::move(test_views_delegate);
 }