views/mus: Install a mus-friend ContextFactory for tests.

ui/views/test/scoped_views_test_helper.cc

Index: ui/views/test/scoped_views_test_helper.cc
diff --git a/ui/views/test/scoped_views_test_helper.cc b/ui/views/test/scoped_views_test_helper.cc
index 051f8e64bc21f92fd0b18fa1bc5071429b801411..05727dbe06774f34aa14d29a218cc8d84e6563b4 100644
--- a/ui/views/test/scoped_views_test_helper.cc
+++ b/ui/views/test/scoped_views_test_helper.cc
@@ -11,7 +11,6 @@
 #include "ui/base/clipboard/clipboard.h"
 #include "ui/base/ime/input_method_initializer.h"
 #include "ui/base/test/test_clipboard.h"
-#include "ui/compositor/test/context_factories_for_test.h"
 #include "ui/views/test/platform_test_helper.h"
 #include "ui/views/test/test_views_delegate.h"
 #include "ui/views/test/views_test_helper.h"
@@ -26,11 +25,10 @@ ScopedViewsTestHelper::ScopedViewsTestHelper(
     : views_delegate_(std::move(views_delegate)),
       platform_test_helper_(PlatformTestHelper::Create()) {
   // The ContextFactory must exist before any Compositors are created.
-  bool enable_pixel_output = false;
   ui::ContextFactory* context_factory = nullptr;
   ui::ContextFactoryPrivate* context_factory_private = nullptr;
-  ui::InitializeContextFactoryForTests(enable_pixel_output, &context_factory,
-                                       &context_factory_private);
+  platform_test_helper_->InitializeContextFactory(&context_factory,
+                                                  &context_factory_private);
 
   views_delegate_->set_context_factory(context_factory);
   views_delegate_->set_context_factory_private(context_factory_private);
@@ -56,8 +54,6 @@ ScopedViewsTestHelper::~ScopedViewsTestHelper() {
   // The Mus PlatformTestHelper has state that is deleted by
   // ui::TerminateContextFactoryForTests().
   platform_test_helper_.reset();
-
-  ui::TerminateContextFactoryForTests();
 }
 
 gfx::NativeWindow ScopedViewsTestHelper::GetContext() {