Remove SurfaceSequence from mus client code.

services/ui/ws/test_change_tracker.cc

Index: services/ui/ws/test_change_tracker.cc
diff --git a/services/ui/ws/test_change_tracker.cc b/services/ui/ws/test_change_tracker.cc
index c5350be50a6e3534aeb692a22599a91a8bdf7004..ac9bae20290f421011d99ea36f9a11db955a06d7 100644
--- a/services/ui/ws/test_change_tracker.cc
+++ b/services/ui/ws/test_change_tracker.cc
@@ -428,14 +428,12 @@ void TestChangeTracker::OnTopLevelCreated(uint32_t change_id,
 void TestChangeTracker::OnWindowSurfaceChanged(
     Id window_id,
     const cc::SurfaceId& surface_id,
-    const cc::SurfaceSequence& surface_sequence,
     const gfx::Size& frame_size,
     float device_scale_factor) {
   Change change;
   change.type = CHANGE_TYPE_SURFACE_CHANGED;
   change.window_id = window_id;
   change.surface_id = surface_id;
-  change.surface_sequence = surface_sequence;
   change.frame_size = frame_size;
   change.device_scale_factor = device_scale_factor;
   AddChange(change);