Dispel the myth that enclosingLayer can return zero

Source/core/page/EventHandler.cpp

Index: Source/core/page/EventHandler.cpp
diff --git a/Source/core/page/EventHandler.cpp b/Source/core/page/EventHandler.cpp
index d82bc54607d16c838aef668a896fc52f0902339c..1d1e23b6c26a4e3580aa02ba8a74bf071678c87e 100644
--- a/Source/core/page/EventHandler.cpp
+++ b/Source/core/page/EventHandler.cpp
@@ -1266,11 +1266,9 @@ OptionalCursor EventHandler::selectAutoCursor(const HitTestResult& result, Node*
 
     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.