Cleanup: Add conversion interface for WebWidget derived classes.

Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 1559 matching lines @@
 
 PagePopup* WebViewImpl::openPagePopup(PagePopupClient* client, const IntRect& originBoundsInRootView)
 {
     ASSERT(client);
     if (hasOpenedPopup())
         hidePopups();
     ASSERT(!m_pagePopup);
 
     WebWidget* popupWidget = m_client->createPopupMenu(WebPopupTypePage);
     ASSERT(popupWidget);
-    m_pagePopup = static_cast<WebPagePopupImpl*>(popupWidget);
+    m_pagePopup = toWebPagePopupImpl(popupWidget);
     if (!m_pagePopup->initialize(this, client, originBoundsInRootView)) {
         m_pagePopup->closePopup();
         m_pagePopup = 0;
     }
     return m_pagePopup.get();
 }
 
 void WebViewImpl::closePagePopup(PagePopup* popup)
 {
     ASSERT(popup);
-    WebPagePopupImpl* popupImpl = static_cast<WebPagePopupImpl*>(popup);
+    WebPagePopupImpl* popupImpl = toWebPagePopupImpl(popup);
     ASSERT(m_pagePopup.get() == popupImpl);
     if (m_pagePopup.get() != popupImpl)
         return;
     m_pagePopup->closePopup();
     m_pagePopup = 0;
 }
 
 void WebViewImpl::hideAutofillPopup()
 {
     if (m_autofillPopupShowing) {
         m_autofillPopup->hidePopup();
         m_autofillPopupShowing = false;
     }
 }
 
 WebHelperPluginImpl* WebViewImpl::createHelperPlugin(const String& pluginType, const WebDocument& hostDocument)
 {
     WebWidget* popupWidget = m_client->createPopupMenu(WebPopupTypeHelperPlugin);
     ASSERT(popupWidget);
-    WebHelperPluginImpl* helperPlugin = static_cast<WebHelperPluginImpl*>(popupWidget);
+    WebHelperPluginImpl* helperPlugin = toWebHelperPluginImpl(popupWidget);
 
     if (!helperPlugin->initialize(pluginType, hostDocument, this)) {
         helperPlugin->closeHelperPlugin();
         helperPlugin = 0;
     }
     return helperPlugin;
 }
 
 void WebViewImpl::closeHelperPluginSoon(PassRefPtr<WebHelperPluginImpl> helperPlugin)
 {
@@ skipping 2199 matching lines @@
     ASSERT(m_autofillPopupShowing);
 
     // Hide the popup if it has become empty.
     if (!m_autofillPopupClient->listSize()) {
         hideAutofillPopup();
         return;
     }
 
     WebRect newWidgetRect = m_autofillPopup->refresh(focusedElement()->pixelSnappedBoundingBox());
     // Let's resize the backing window if necessary.
-    WebPopupMenuImpl* popupMenu = static_cast<WebPopupMenuImpl*>(m_autofillPopup->client());
+    WebPopupMenuImpl* popupMenu = toWebPopupMenuImpl(m_autofillPopup->client());
     if (popupMenu && popupMenu->client()->windowRect() != newWidgetRect)
         popupMenu->client()->setWindowRect(newWidgetRect);
 }
 
 Element* WebViewImpl::focusedElement()
 {
     Frame* frame = m_page->focusController().focusedFrame();
     if (!frame)
         return 0;
 
@@ skipping 387 matching lines @@
     //    the initial viewport width.
     // 2. The author has disabled viewport zoom.
 
     const PageScaleConstraints& constraints = m_pageScaleConstraintsSet.pageDefinedConstraints();
 
     return fixedLayoutSize().width == m_size.width
         || (constraints.minimumScale == constraints.maximumScale && constraints.minimumScale != -1);
 }
 
 } // namespace WebKit