Rename AXObject to AXObjectImpl in modules/ and web/

third_party/WebKit/Source/core/dom/AXObject.h

+// Copyright 2017 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 AXObject_h
+#define AXObject_h
+
+#include "core/CoreExport.h"
+
+namespace blink {
+
+// TODO(sashab): Add pure virtual methods to this class to remove dependencies
+// on AXObjectImpl from outside of modules/.
+class CORE_EXPORT AXObject {};
+
+}  // namespace blink
+
+#endif  // AXObject_h