Use tighter typing in editing/

Source/core/editing/VisiblePosition.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Portions Copyright (c) 2011 Motorola Mobility, 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:
  * 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 439 matching lines @@
 
     // FIXME: This may need to do something different from "after".
     return honorEditingBoundaryAtOrAfter(right);
 }
 
 VisiblePosition VisiblePosition::honorEditingBoundaryAtOrBefore(const VisiblePosition &pos) const
 {
     if (pos.isNull())
         return pos;
 
-    Node* highestRoot = highestEditableRoot(deepEquivalent());
+    ContainerNode* highestRoot = highestEditableRoot(deepEquivalent());
 
     // Return empty position if pos is not somewhere inside the editable region containing this position
     if (highestRoot && !pos.deepEquivalent().deprecatedNode()->isDescendantOf(highestRoot))
         return VisiblePosition();
 
     // Return pos itself if the two are from the very same editable region, or both are non-editable
     // FIXME: In the non-editable case, just because the new position is non-editable doesn't mean movement
     // to it is allowed.  VisibleSelection::adjustForEditableContent has this problem too.
     if (highestEditableRoot(pos.deepEquivalent()) == highestRoot)
         return pos;
 
     // Return empty position if this position is non-editable, but pos is editable
     // FIXME: Move to the previous non-editable region.
     if (!highestRoot)
         return VisiblePosition();
 
     // Return the last position before pos that is in the same editable region as this position
     return lastEditableVisiblePositionBeforePositionInRoot(pos.deepEquivalent(), highestRoot);
 }
 
 VisiblePosition VisiblePosition::honorEditingBoundaryAtOrAfter(const VisiblePosition &pos) const
 {
     if (pos.isNull())
         return pos;
 
-    Node* highestRoot = highestEditableRoot(deepEquivalent());
+    ContainerNode* highestRoot = highestEditableRoot(deepEquivalent());
 
     // Return empty position if pos is not somewhere inside the editable region containing this position
     if (highestRoot && !pos.deepEquivalent().deprecatedNode()->isDescendantOf(highestRoot))
         return VisiblePosition();
 
     // Return pos itself if the two are from the very same editable region, or both are non-editable
     // FIXME: In the non-editable case, just because the new position is non-editable doesn't mean movement
     // to it is allowed.  VisibleSelection::adjustForEditableContent has this problem too.
     if (highestEditableRoot(pos.deepEquivalent()) == highestRoot)
         return pos;
 
     // Return empty position if this position is non-editable, but pos is editable
     // FIXME: Move to the next non-editable region.
     if (!highestRoot)
         return VisiblePosition();
 
     // Return the next position after pos that is in the same editable region as this position
     return firstEditableVisiblePositionAfterPositionInRoot(pos.deepEquivalent(), highestRoot);
 }
 
 VisiblePosition VisiblePosition::skipToStartOfEditingBoundary(const VisiblePosition &pos) const
 {
     if (pos.isNull())
         return pos;
 
-    Node* highestRoot = highestEditableRoot(deepEquivalent());
-    Node* highestRootOfPos = highestEditableRoot(pos.deepEquivalent());
+    ContainerNode* highestRoot = highestEditableRoot(deepEquivalent());
+    ContainerNode* highestRootOfPos = highestEditableRoot(pos.deepEquivalent());
 
     // Return pos itself if the two are from the very same editable region, or both are non-editable.
     if (highestRootOfPos == highestRoot)
         return pos;
 
     // If |pos| has an editable root, skip to the start
     if (highestRootOfPos)
         return VisiblePosition(previousVisuallyDistinctCandidate(Position(highestRootOfPos, Position::PositionIsBeforeAnchor).parentAnchoredEquivalent()));
 
     // That must mean that |pos| is not editable. Return the last position before pos that is in the same editable region as this position
     return lastEditableVisiblePositionBeforePositionInRoot(pos.deepEquivalent(), highestRoot);
 }
 
 VisiblePosition VisiblePosition::skipToEndOfEditingBoundary(const VisiblePosition &pos) const
 {
     if (pos.isNull())
         return pos;
 
-    Node* highestRoot = highestEditableRoot(deepEquivalent());
-    Node* highestRootOfPos = highestEditableRoot(pos.deepEquivalent());
+    ContainerNode* highestRoot = highestEditableRoot(deepEquivalent());
+    ContainerNode* highestRootOfPos = highestEditableRoot(pos.deepEquivalent());
 
     // Return pos itself if the two are from the very same editable region, or both are non-editable.
     if (highestRootOfPos == highestRoot)
         return pos;
 
     // If |pos| has an editable root, skip to the end
     if (highestRootOfPos)
         return VisiblePosition(Position(highestRootOfPos, Position::PositionIsAfterAnchor).parentAnchoredEquivalent());
 
     // That must mean that |pos| is not editable. Return the next position after pos that is in the same editable region as this position
@@ skipping 260 matching lines @@
     if (vpos)
         vpos->showTreeForThis();
 }
 
 void showTree(const blink::VisiblePosition& vpos)
 {
     vpos.showTreeForThis();
 }
 
 #endif