Allow the user to cancel the capture region action, and show its active status in the tray.

ash/common/system/chromeos/palette/tools/capture_region_action.h

Index: ash/common/system/chromeos/palette/tools/capture_region_action.h
diff --git a/ash/common/system/chromeos/palette/tools/capture_region_action.h b/ash/common/system/chromeos/palette/tools/capture_region_action.h
deleted file mode 100644
index a40365604811a8e13956f279c345c80d53fa41cf..0000000000000000000000000000000000000000
--- a/ash/common/system/chromeos/palette/tools/capture_region_action.h
+++ /dev/null
@@ -1,33 +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 ASH_COMMON_SYSTEM_CHROMEOS_PALETTE_CAPTURE_REGION_ACTION_H_
-#define ASH_COMMON_SYSTEM_CHROMEOS_PALETTE_CAPTURE_REGION_ACTION_H_
-
-#include "ash/ash_export.h"
-#include "ash/common/system/chromeos/palette/common_palette_tool.h"
-
-namespace ash {
-
-class ASH_EXPORT CaptureRegionAction : public CommonPaletteTool {
- public:
-  explicit CaptureRegionAction(Delegate* delegate);
-  ~CaptureRegionAction() override;
-
- private:
-  // PaletteTool:
-  PaletteGroup GetGroup() const override;
-  PaletteToolId GetToolId() const override;
-  void OnEnable() override;
-  views::View* CreateView() override;
-
-  // CommonPaletteTool:
-  gfx::VectorIconId GetPaletteIconId() override;
-
-  DISALLOW_COPY_AND_ASSIGN(CaptureRegionAction);
-};
-
-}  // namespace ash
-
-#endif  // ASH_COMMON_SYSTEM_CHROMEOS_PALETTE_CAPTURE_REGION_ACTION_H_