Revert of Resurrect Aura Linux accessibility.

ui/accessibility/platform/ax_platform_node_auralinux.h

Index: ui/accessibility/platform/ax_platform_node_auralinux.h
diff --git a/ui/accessibility/platform/ax_platform_node_auralinux.h b/ui/accessibility/platform/ax_platform_node_auralinux.h
deleted file mode 100644
index eea142736d6b842a7e06e942032cff862658ed91..0000000000000000000000000000000000000000
--- a/ui/accessibility/platform/ax_platform_node_auralinux.h
+++ /dev/null
@@ -1,51 +0,0 @@
-// 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 UI_ACCESSIBILITY_AX_PLATFORM_NODE_AURALINUX_H_
-#define UI_ACCESSIBILITY_AX_PLATFORM_NODE_AURALINUX_H_
-
-#include <atk/atk.h>
-
-#include "ui/accessibility/ax_export.h"
-#include "ui/accessibility/platform/ax_platform_node_base.h"
-
-namespace ui {
-
-// Implements accessibility on Aura Linux using ATK.
-class AXPlatformNodeAuraLinux : public AXPlatformNodeBase {
- public:
-  AXPlatformNodeAuraLinux();
-
-  // Set or get the root-level Application object that's the parent of all
-  // top-level windows.
-  AX_EXPORT static void SetApplication(AXPlatformNode* application);
-  static AXPlatformNode* application() { return application_; }
-
-  AtkRole GetAtkRole();
-
-  // AXPlatformNode overrides.
-  void Destroy() override;
-  gfx::NativeViewAccessible GetNativeViewAccessible() override;
-  void NotifyAccessibilityEvent(ui::AXEvent event_type) override;
-
-  // AXPlatformNodeBase overrides.
-  void Init(AXPlatformNodeDelegate* delegate) override;
-  int GetIndexInParent() override;
-
- private:
-  ~AXPlatformNodeAuraLinux() override;
-
-  // We own a reference to this ref-counted object.
-  AtkObject* atk_object_;
-
-  // The root-level Application object that's the parent of all
-  // top-level windows.
-  static AXPlatformNode* application_;
-
-  DISALLOW_COPY_AND_ASSIGN(AXPlatformNodeAuraLinux);
-};
-
-}  // namespace ui
-
-#endif  // UI_ACCESSIBILITY_AX_PLATFORM_NODE_AURALINUX_H_