Remove SurfaceReferenceManager interface.

cc/surfaces/surface_reference_manager.h

Index: cc/surfaces/surface_reference_manager.h
diff --git a/cc/surfaces/surface_reference_manager.h b/cc/surfaces/surface_reference_manager.h
deleted file mode 100644
index 7eec022f9d5c54437f885c31751b1a98da7f9153..0000000000000000000000000000000000000000
--- a/cc/surfaces/surface_reference_manager.h
+++ /dev/null
@@ -1,57 +0,0 @@
-// Copyright 2016 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.
-
-#ifndef CC_SURFACES_SURFACE_REFERENCE_MANAGER_H_
-#define CC_SURFACES_SURFACE_REFERENCE_MANAGER_H_
-
-#include "cc/surfaces/surface_reference.h"
-
-namespace cc {
-
-class SurfaceId;
-
-// Interface to manage surface references.
-class SurfaceReferenceManager {
- public:
-  // Returns the top level root SurfaceId. Surfaces that are not reachable
-  // from the top level root may be garbage collected. It will not be a valid
-  // SurfaceId and will never correspond to a surface.
-  virtual const SurfaceId& GetRootSurfaceId() const = 0;
-
-  // Adds a reference from a parent surface to a child surface. Any surface
-  // embedding a child surface should have a reference added so that the child
-  // surface is not garbage collected until after the parent surface.
-  virtual void AddSurfaceReference(const SurfaceId& parent_id,
-                                   const SurfaceId& child_id) = 0;
-
-  // Removes a reference from a parent surface to a child surface.
-  virtual void RemoveSurfaceReference(const SurfaceId& parent_id,
-                                      const SurfaceId& child_id) = 0;
-
-  // Adds surface references. For each reference added, this will remove the
-  // temporary reference to the child surface if one exists.
-  virtual void AddSurfaceReferences(
-      const std::vector<SurfaceReference>& references) = 0;
-
-  // Removes surface references.
-  virtual void RemoveSurfaceReferences(
-      const std::vector<SurfaceReference>& references) = 0;
-
-  // Returns the number of surfaces that have references to |surface_id|. When
-  // the count is zero nothing is referencing the surface and it may be garbage
-  // collected.
-  virtual size_t GetSurfaceReferenceCount(
-      const SurfaceId& surface_id) const = 0;
-
-  // Returns the number of surfaces that |surface_id| has references to.
-  virtual size_t GetReferencedSurfaceCount(
-      const SurfaceId& surface_id) const = 0;
-
- protected:
-  virtual ~SurfaceReferenceManager() {}
-};
-
-}  // namespace cc
-
-#endif  // CC_SURFACES_SURFACE_REFERENCE_MANAGER_H_