cc: Remove SurfaceDependencies type

cc/surfaces/surface_factory.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/surfaces/surface_factory.h"
 
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 110 matching lines @@
   client_->ReferencedSurfacesChanged(surface->surface_id().local_surface_id(),
                                      surface->active_referenced_surfaces());
   if (!manager_->SurfaceModified(surface->surface_id())) {
     TRACE_EVENT_INSTANT0("cc", "Damage not visible.", TRACE_EVENT_SCOPE_THREAD);
     surface->RunDrawCallback();
   }
 }
 
 void SurfaceFactory::OnSurfaceDependenciesChanged(
     Surface* surface,
-    const SurfaceDependencies& added_dependencies,
-    const SurfaceDependencies& removed_dependencies) {}
+    const base::flat_set<SurfaceId>& added_dependencies,
+    const base::flat_set<SurfaceId>& removed_dependencies) {}
 
 void SurfaceFactory::OnSurfaceDiscarded(Surface* surface) {}
 
 std::unique_ptr<Surface> SurfaceFactory::Create(
     const LocalSurfaceId& local_surface_id) {
   seen_first_frame_activation_ = false;
   std::unique_ptr<Surface> surface =
       manager_->CreateSurface(weak_factory_.GetWeakPtr(), local_surface_id);
   surface->AddObserver(this);
   return surface;
 }
 
 void SurfaceFactory::Destroy(std::unique_ptr<Surface> surface) {
   surface->RemoveObserver(this);
   manager_->DestroySurface(std::move(surface));
 }
 
 }  // namespace cc