WIP (Introduce WTF::NonNullPtr<T>.)

Source/core/page/FocusController.cpp

 /*
  * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nuanti Ltd.
  *
  * 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.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 45 matching lines @@
 #include "core/page/Settings.h"
 #include "core/page/SpatialNavigation.h"
 #include "core/rendering/HitTestResult.h"
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
 // FIXME: Some of Node* return values and Node* arguments should be Element*.
 
-FocusNavigationScope::FocusNavigationScope(TreeScope* treeScope)
+FocusNavigationScope::FocusNavigationScope(NonNullPtr<TreeScope> treeScope)
     : m_rootTreeScope(treeScope)
 {
-    ASSERT(treeScope);
 }
 
 Node* FocusNavigationScope::rootNode() const
 {
     return m_rootTreeScope->rootNode();
 }
 
 Element* FocusNavigationScope::owner() const
 {
     Node* root = rootNode();
     if (root->isShadowRoot()) {
         ShadowRoot* shadowRoot = toShadowRoot(root);
         return shadowRoot->isYoungest() ? shadowRoot->host() : shadowRoot->insertionPoint();
     }
     if (Frame* frame = root->document().frame())
         return frame->ownerElement();
     return 0;
 }
 
 FocusNavigationScope FocusNavigationScope::focusNavigationScopeOf(Node* node)
 {
     ASSERT(node);
     Node* root = node;
     for (Node* n = node; n; n = n->parentNode())
         root = n;
     // The result is not always a ShadowRoot nor a DocumentNode since
     // a starting node is in an orphaned tree in composed shadow tree.
-    return FocusNavigationScope(&root->treeScope());
+    return FocusNavigationScope(root->treeScope());
 }
 
 FocusNavigationScope FocusNavigationScope::ownedByNonFocusableFocusScopeOwner(Node* node)
 {
     if (isShadowHost(node))
         return FocusNavigationScope::ownedByShadowHost(node);
     ASSERT(isActiveShadowInsertionPoint(node));
     return FocusNavigationScope::ownedByShadowInsertionPoint(toHTMLShadowElement(node));
 }
 
@@ skipping 781 matching lines @@
         startingRect = nodeRectInAbsoluteCoordinates(container, true /* ignore border */);
         container = scrollableEnclosingBoxOrParentFrameForNodeInDirection(direction, container);
         if (container && container->isDocumentNode())
             toDocument(container)->updateLayoutIgnorePendingStylesheets();
     } while (!consumed && container);
 
     return consumed;
 }
 
 } // namespace WebCore