Rename Sky's custom2 to custom

sky/engine/core/dom/custom2/new_custom_element.h

Index: sky/engine/core/dom/custom2/new_custom_element.h
diff --git a/sky/engine/core/dom/custom2/new_custom_element.h b/sky/engine/core/dom/custom2/new_custom_element.h
deleted file mode 100644
index 9c3b76c4ff1427dd87de07f859389511808a0f5c..0000000000000000000000000000000000000000
--- a/sky/engine/core/dom/custom2/new_custom_element.h
+++ /dev/null
@@ -1,26 +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 SKY_ENGINE_CORE_DOM_CUSTOM_NEW_CUSTOM_ELEMENT_H_
-#define SKY_ENGINE_CORE_DOM_CUSTOM_NEW_CUSTOM_ELEMENT_H_
-
-#include "sky/engine/wtf/text/AtomicString.h"
-
-namespace blink {
-class Document;
-class Element;
-
-class NewCustomElement {
- public:
-  static void AttributeDidChange(Element*, const AtomicString& name, const AtomicString& oldValue, const AtomicString& newValue);
-  static void DidAttach(Element*, Document&);
-  static void DidDetach(Element*, Document&);
-
- private:
-  NewCustomElement();
-};
-
-}  // namespace blink
-
-#endif  // SKY_ENGINE_CORE_DOM_CUSTOM_NEW_CUSTOM_ELEMENT_H_