Move character{After,Before}() for VisiblePosition to VisibleUnits.cpp

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 572 matching lines @@
 {
     return VisiblePosition::createWithoutCanonicalization(visiblePositionOfAlgorithm<EditingStrategy>(position, affinity));
 }
 
 VisiblePosition visiblePositionOf(const PositionInComposedTree& position, TextAffinity affinity)
 {
     PositionInComposedTreeWithAffinity canonicalized = visiblePositionOfAlgorithm<EditingInComposedTreeStrategy>(position, affinity);
     return VisiblePosition::createWithoutCanonicalization(PositionWithAffinity(toPositionInDOMTree(canonicalized.position()), canonicalized.affinity()));
 }
 
-UChar32 characterAfter(const VisiblePosition& visiblePosition)
-{
-    // We canonicalize to the first of two equivalent candidates, but the second
-    // of the two candidates is the one that will be inside the text node
-    // containing the character after this visible position.
-    Position pos = mostForwardCaretPosition(visiblePosition.deepEquivalent());
-    if (!pos.isOffsetInAnchor())
-        return 0;
-    Node* containerNode = pos.computeContainerNode();
-    if (!containerNode || !containerNode->isTextNode())
-        return 0;
-    unsigned offset = static_cast<unsigned>(pos.offsetInContainerNode());
-    Text* textNode = toText(containerNode);
-    unsigned length = textNode->length();
-    if (offset >= length)
-        return 0;
-
-    return textNode->data().characterStartingAt(offset);
-}
-
-UChar32 characterBefore(const VisiblePosition& visiblePosition)
-{
-    return characterAfter(previousPositionOf(visiblePosition));
-}
-
 IntRect absoluteCaretBoundsOf(const VisiblePosition& visiblePosition)
 {
     LayoutObject* layoutObject;
     LayoutRect localRect = localCaretRectOfPosition(visiblePosition.toPositionWithAffinity(), layoutObject);
     if (localRect.isEmpty() || !layoutObject)
         return IntRect();
 
     return layoutObject->localToAbsoluteQuad(FloatRect(localRect)).enclosingBoundingBox();
 }
 
@@ skipping 59 matching lines @@
     else
         fprintf(stderr, "Cannot showTree for (nil) VisiblePosition.\n");
 }
 
 void showTree(const blink::VisiblePosition& vpos)
 {
     vpos.showTreeForThis();
 }
 
 #endif