Makes tests either use mock compositor or mock WebGraphicsContext3D

ui/views/widget/native_widget_win.cc

Index: ui/views/widget/native_widget_win.cc
diff --git a/ui/views/widget/native_widget_win.cc b/ui/views/widget/native_widget_win.cc
index 5e3ed379dfb218c1fc73ab2e3d2e0ec7277e4b70..d6a3ce3eb6e5f8a2bc5893876eb6940762c8efd0 100644
--- a/ui/views/widget/native_widget_win.cc
+++ b/ui/views/widget/native_widget_win.cc
@@ -1164,15 +1164,11 @@ LRESULT NativeWidgetWin::OnCreate(CREATESTRUCT* create_struct) {
 
 #if defined(VIEWS_COMPOSITOR)
   if (View::get_use_acceleration_when_possible()) {
-    if (ui::Compositor::compositor_factory()) {
-      compositor_ = (*Widget::compositor_factory())(this);
-    } else {
-      CRect window_rect;
-      GetClientRect(&window_rect);
-      compositor_ = ui::Compositor::Create(this,
-          hwnd(),
-          gfx::Size(window_rect.Width(), window_rect.Height()));
-    }
+    CRect window_rect;
+    GetClientRect(&window_rect);
+    compositor_ = ui::Compositor::Create(this,
+        hwnd(),
+        gfx::Size(window_rect.Width(), window_rect.Height()));
     if (compositor_.get()) {
       delegate_->AsWidget()->GetRootView()->SetPaintToLayer(true);
       compositor_->SetRootLayer(delegate_->AsWidget()->GetRootView()->layer());