Implement PopupMenu::updateFromElement() for ExternalPopupMenu.

third_party/WebKit/Source/core/html/HTMLSelectElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLSelectElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLSelectElement.cpp b/third_party/WebKit/Source/core/html/HTMLSelectElement.cpp
index 715dd8552d7946f17dc1bfc36f734ae3e1e38d60..0b439d853146ba9791e8b18509722ab81f0df182 100644
--- a/third_party/WebKit/Source/core/html/HTMLSelectElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLSelectElement.cpp
@@ -1984,9 +1984,9 @@ void HTMLSelectElement::showPopup()
     m_popupIsVisible = true;
 
     LayoutMenuList* menuList = toLayoutMenuList(layoutObject());
-    FloatQuad quad(menuList->localToAbsoluteQuad(FloatQuad(menuList->borderBoundingBox())));
     IntSize size = pixelSnappedIntRect(menuList->frameRect()).size();
-    m_popup->show(quad, size, optionToListIndex(selectedIndex()));
+    // TODO(tkent): Remove show() arguments.  They are unused.
+    m_popup->show(FloatQuad(), size, optionToListIndex(selectedIndex()));
     if (AXObjectCache* cache = document().existingAXObjectCache())
         cache->didShowMenuListPopup(menuList);
 }