Revert of Make ui::Compositor use ui::Scheduler

ui/compositor/test/test_compositor_host_ozone.cc

Index: ui/compositor/test/test_compositor_host_ozone.cc
diff --git a/ui/compositor/test/test_compositor_host_ozone.cc b/ui/compositor/test/test_compositor_host_ozone.cc
index 0d3861e68f664ead23ee2764e899f129f2f149d3..4871564cc8892a177798e30b475b35357091ff55 100644
--- a/ui/compositor/test/test_compositor_host_ozone.cc
+++ b/ui/compositor/test/test_compositor_host_ozone.cc
@@ -26,6 +26,8 @@
   // Overridden from TestCompositorHost:
   virtual void Show() override;
   virtual ui::Compositor* GetCompositor() override;
+
+  void Draw();
 
   gfx::Rect bounds_;
 
@@ -62,6 +64,11 @@
   return compositor_.get();
 }
 
+void TestCompositorHostOzone::Draw() {
+  if (compositor_.get())
+    compositor_->Draw();
+}
+
 // static
 TestCompositorHost* TestCompositorHost::Create(
     const gfx::Rect& bounds,