cc: one copy is default as well as final fallback.

ui/compositor/compositor_switches.cc

Index: ui/compositor/compositor_switches.cc
diff --git a/ui/compositor/compositor_switches.cc b/ui/compositor/compositor_switches.cc
index 413b8212a583f563f715e55239a116d8ce23c88e..013456eefdc8ece87db0ca3c0ef74bbac117b37a 100644
--- a/ui/compositor/compositor_switches.cc
+++ b/ui/compositor/compositor_switches.cc
@@ -34,9 +34,4 @@ bool IsUIZeroCopyEnabled() {
   return command_line.HasSwitch(switches::kUIEnableZeroCopy);
 }
 
-bool IsUIOneCopyEnabled() {
-  // One-copy is on by default unless zero copy is enabled.
-  return !IsUIZeroCopyEnabled();
-}
-
 }  // namespace ui