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

ui/compositor/test/test_compositor_host_x11.cc

Index: ui/compositor/test/test_compositor_host_x11.cc
diff --git a/ui/compositor/test/test_compositor_host_x11.cc b/ui/compositor/test/test_compositor_host_x11.cc
index 2dad2fcc5057c1ac5770fe0299d1f236b260fcc9..56ff793de548fa6b2b116622d37225bd761657a9 100644
--- a/ui/compositor/test/test_compositor_host_x11.cc
+++ b/ui/compositor/test/test_compositor_host_x11.cc
@@ -29,6 +29,8 @@
   // Overridden from TestCompositorHost:
   void Show() override;
   ui::Compositor* GetCompositor() override;
+
+  void Draw();
 
   gfx::Rect bounds_;
 
@@ -83,6 +85,11 @@
   return compositor_.get();
 }
 
+void TestCompositorHostX11::Draw() {
+  if (compositor_.get())
+    compositor_->Draw();
+}
+
 // static
 TestCompositorHost* TestCompositorHost::Create(
     const gfx::Rect& bounds,