Page::chrome() should return a reference.

Source/core/platform/chromium/PopupContainer.cpp

 /*
  * Copyright (c) 2011, 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 351 matching lines @@
     gc->drawRect(IntRect(tx + width() - borderSize, ty, borderSize, height()));
 }
 
 bool PopupContainer::isInterestedInEventForKey(int keyCode)
 {
     return m_listBox->isInterestedInEventForKey(keyCode);
 }
 
 ChromeClient* PopupContainer::chromeClient()
 {
-    return m_frameView->frame()->page()->chrome()->client();
+    return m_frameView->frame()->page()->chrome().client();
 }
 
 void PopupContainer::showInRect(const FloatQuad& controlPosition, const IntSize& controlSize, FrameView* v, int index)
 {
     // The controlSize is the size of the select box. It's usually larger than
     // we need. Subtract border size so that usually the container will be
     // displayed exactly the same width as the select box.
     listBox()->setBaseWidth(max(controlSize.width() - borderSize * 2, 0));
 
     listBox()->updateFromElement();
@@ skipping 69 matching lines @@
 
 String PopupContainer::getSelectedItemToolTip()
 {
     // We cannot use m_popupClient->selectedIndex() to choose tooltip message,
     // because the selectedIndex() might return final selected index, not
     // hovering selection.
     return listBox()->m_popupClient->itemToolTip(listBox()->m_selectedIndex);
 }
 
 } // namespace WebCore