Remove parts of //cc we aren't using

cc/resources/priority_calculator.h

-// Copyright 2010 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_RESOURCES_PRIORITY_CALCULATOR_H_
-#define CC_RESOURCES_PRIORITY_CALCULATOR_H_
-
-#include "base/basictypes.h"
-#include "cc/base/cc_export.h"
-
-namespace gfx { class Rect; }
-
-namespace cc {
-
-class CC_EXPORT PriorityCalculator {
- public:
-  PriorityCalculator() {}
-
-  static int UIPriority(bool draws_to_root_surface);
-  static int VisiblePriority(bool draws_to_root_surface);
-  static int RenderSurfacePriority();
-  static int LingeringPriority(int previous_priority);
-  static int PriorityFromDistance(const gfx::Rect& visible_rect,
-                                  const gfx::Rect& texture_rect,
-                                  bool draws_to_root_surface);
-  static int SmallAnimatedLayerMinPriority();
-
-  static int HighestPriority();
-  static int LowestPriority();
-  static inline bool priority_is_lower(int a, int b) { return a > b; }
-  static inline bool priority_is_higher(int a, int b) { return a < b; }
-  static inline int max_priority(int a, int b) {
-    return priority_is_higher(a, b) ? a : b;
-  }
-
-  static int AllowNothingCutoff();
-  static int AllowVisibleOnlyCutoff();
-  static int AllowVisibleAndNearbyCutoff();
-  static int AllowEverythingCutoff();
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(PriorityCalculator);
-};
-
-}  // namespace cc
-
-#endif  // CC_RESOURCES_PRIORITY_CALCULATOR_H_