Purge the ScrollBlocksOn code.

cc/layers/scroll_blocks_on.h

-// Copyright 2015 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_LAYERS_SCROLL_BLOCKS_ON_H_
-#define CC_LAYERS_SCROLL_BLOCKS_ON_H_
-
-enum ScrollBlocksOn {
-  SCROLL_BLOCKS_ON_NONE = 0x0,
-  SCROLL_BLOCKS_ON_START_TOUCH = 0x1,
-  SCROLL_BLOCKS_ON_WHEEL_EVENT = 0x2,
-  SCROLL_BLOCKS_ON_SCROLL_EVENT = 0x4,
-  SCROLL_BLOCKS_ON_MAX = SCROLL_BLOCKS_ON_START_TOUCH |
-                         SCROLL_BLOCKS_ON_WHEEL_EVENT |
-                         SCROLL_BLOCKS_ON_SCROLL_EVENT
-};
-
-inline ScrollBlocksOn operator|(ScrollBlocksOn a, ScrollBlocksOn b) {
-  return ScrollBlocksOn(static_cast<int>(a) | static_cast<int>(b));
-}
-
-inline ScrollBlocksOn& operator|=(ScrollBlocksOn& a, ScrollBlocksOn b) {
-  return a = a | b;
-}
-
-#endif  // CC_LAYERS_SCROLL_BLOCKS_ON_H_