Rename DisplayCompositor to MojoFrameSinkManager.

services/ui/public/interfaces/window_tree.mojom

Index: services/ui/public/interfaces/window_tree.mojom
diff --git a/services/ui/public/interfaces/window_tree.mojom b/services/ui/public/interfaces/window_tree.mojom
index cd06b9e2350e3adae7e07535837130c853763ae0..3d6b554e1930ce7a75399f84a463920970fb4fa7 100644
--- a/services/ui/public/interfaces/window_tree.mojom
+++ b/services/ui/public/interfaces/window_tree.mojom
@@ -330,7 +330,7 @@ interface WindowTreeClient {
   // in which case it will be null. |parent_drawn| is true if roots parent is
   // drawn, see OnParentDrawnStateChanged() for details. |display_id| identifies
   // the display this root window is on. |frame_sink_id| uniquely identifies the
-  // client in the display compositor. If the embedded window has a size,
+  // client in the frame sink manager. If the embedded window has a size,
   // |local_surface_id| identifies the ID to use to submit CompositorFrames.
   OnEmbed(uint16 connection_id,
           WindowData root,