ash: removes AcceleratorHandler

It's no longer used.

BUG=842365
TEST=none (removal of dead code only)

Change-Id: I7ec73de3686591c4697ea6b58dfbeeb5961d0648
Reviewed-on: https://chromium-review.googlesource.com/1146983Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577195}

ash/BUILD.gn

@@ -32,7 +32,6 @@ component("ash") {
     "accelerators/accelerator_controller.h",
     "accelerators/accelerator_delegate.cc",
     "accelerators/accelerator_delegate.h",
-    "accelerators/accelerator_handler.h",
     "accelerators/accelerator_ids.h",
     "accelerators/accelerator_router.cc",
     "accelerators/accelerator_router.h",

ash/accelerators/accelerator_handler.h

-// 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 ASH_ACCELERATORS_ACCELERATOR_HANDLER_H_
-#define ASH_ACCELERATORS_ACCELERATOR_HANDLER_H_
-
-#include <stdint.h>
-
-#include <string>
-#include <vector>
-
-#include "base/containers/flat_map.h"
-#include "services/ui/public/interfaces/window_manager.mojom.h"
-
-namespace ash {
-
-// Used by WindowManager for handling accelerators. This is only used in mash.
-// TODO: this should no longer be necessary, remove. https://crbug.com/842365
-class AcceleratorHandler {
- public:
-  // See WindowManagerDelegate for details on |properties|.
-  virtual ui::mojom::EventResult OnAccelerator(
-      uint32_t id,
-      const ui::Event& event,
-      base::flat_map<std::string, std::vector<uint8_t>>* properties) = 0;
-
- protected:
-  virtual ~AcceleratorHandler() {}
-};
-
-}  // namespace ash
-
-#endif  // ASH_ACCELERATORS_ACCELERATOR_HANDLER_H_