Revert Implement <select> Popup Menu using PagePopup

Source/web/PopupMenuImpl.h

-// Copyright (c) 2014 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 PopupMenuImpl_h
-#define PopupMenuImpl_h
-
-#include "core/html/forms/PopupMenuClient.h"
-#include "core/page/PagePopupClient.h"
-#include "platform/PopupMenu.h"
-
-namespace blink {
-
-class ChromeClientImpl;
-class PagePopup;
-class HTMLElement;
-class HTMLHRElement;
-class HTMLOptGroupElement;
-class HTMLOptionElement;
-
-class PopupMenuImpl final : public PopupMenu, public PagePopupClient {
-public:
-    static PassRefPtrWillBeRawPtr<PopupMenuImpl> create(ChromeClientImpl*, PopupMenuClient*);
-    virtual ~PopupMenuImpl();
-
-    void dispose();
-
-private:
-    PopupMenuImpl(ChromeClientImpl*, PopupMenuClient*);
-
-    void addOption(HTMLOptionElement&, SharedBuffer*);
-    void addOptGroup(HTMLOptGroupElement&, SharedBuffer*);
-    void addSeparator(HTMLHRElement&, SharedBuffer*);
-    void addElementStyle(HTMLElement&, SharedBuffer*);
-
-    // PopupMenu functions:
-    void show(const FloatQuad& controlPosition, const IntSize& controlSize, int index) override;
-    void hide() override;
-    void updateFromElement() override;
-    void disconnectClient() override;
-
-    // PagePopupClient functions:
-    IntSize contentSize() override;
-    void writeDocument(SharedBuffer*) override;
-    void didWriteDocument(Document&) override;
-    void setValueAndClosePopup(int, const String&) override;
-    void setValue(const String&) override;
-    void closePopup() override;
-    Element& ownerElement() override;
-    Locale& locale() override;
-    void didClosePopup() override;
-
-    ChromeClientImpl* m_chromeClient;
-    PopupMenuClient* m_client;
-    PagePopup* m_popup;
-    // If >= 0, this is the index we should accept when the popup closes.
-    // This is used for keyboard navigation, where we want the
-    // text to change immediately but set the value on close.
-    int m_indexToSetOnClose;
-};
-
-}
-
-#endif // PopupMenuImpl_h