Dispel the myth that enclosingLayer can return zero

Source/core/page/EventHandler.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 1248 matching lines @@
 
 OptionalCursor EventHandler::selectAutoCursor(const HitTestResult& result, Node* node, const Cursor& iBeam, bool shiftKey)
 {
     bool editable = (node && node->rendererIsEditable());
 
     if (useHandCursor(node, result.isOverLink(), shiftKey))
         return handCursor();
 
     bool inResizer = false;
     RenderObject* renderer = node ? node->renderer() : 0;
-    if (renderer) {
-        if (RenderLayer* layer = renderer->enclosingLayer()) {
-            if (m_frame->view())
-                inResizer = layer->scrollableArea() && layer->scrollableArea()->isPointInResizeControl(result.roundedPointInMainFrame(), ResizerForPointer);
-        }
+    if (renderer && m_frame->view()) {
+        RenderLayer* layer = renderer->enclosingLayer();
+        inResizer = layer->scrollableArea() && layer->scrollableArea()->isPointInResizeControl(result.roundedPointInMainFrame(), ResizerForPointer);
     }
 
     // During selection, use an I-beam no matter what we're over.
     // If a drag may be starting or we're capturing mouse events for a particular node, don't treat this as a selection.
     if (m_mousePressed && m_mouseDownMayStartSelect
         && !m_mouseDownMayStartDrag
         && m_frame->selection().isCaretOrRange()
         && !m_capturingMouseEventsNode) {
         return iBeam;
     }
@@ skipping 2763 matching lines @@
 unsigned EventHandler::accessKeyModifiers()
 {
 #if OS(MACOSX)
     return PlatformEvent::CtrlKey | PlatformEvent::AltKey;
 #else
     return PlatformEvent::AltKey;
 #endif
 }
 
 } // namespace WebCore