Revert of cc: Make LayerTreeTests use a DelegatingRenderer and Display.

services/ui/surfaces/display_compositor.cc

Index: services/ui/surfaces/display_compositor.cc
diff --git a/services/ui/surfaces/display_compositor.cc b/services/ui/surfaces/display_compositor.cc
index 5cb51a19d13c6a272473408d3871c82933739c21..1f38c4f88c6a5ea8f1dff4bf31bdc86da51b3db0 100644
--- a/services/ui/surfaces/display_compositor.cc
+++ b/services/ui/surfaces/display_compositor.cc
@@ -121,16 +121,4 @@
 void DisplayCompositor::DisplaySetMemoryPolicy(
     const cc::ManagedMemoryPolicy& policy) {}
 
-void DisplayCompositor::DisplayWillDrawAndSwap(
-    bool will_draw_and_swap,
-    const cc::RenderPassList& render_passes) {
-  // This notification is not relevant to our client outside of tests.
-}
-
-void DisplayCompositor::DisplayDidDrawAndSwap() {
-  // This notification is not relevant to our client outside of tests. We
-  // unblock the client from the DrawCallback when the surface is going to
-  // be drawn.
-}
-
 }  // namespace ui