Move {next,previous}PositionOf() to EditingUtilities.{cpp,h} from Position.{cpp,h}

Source/core/editing/Position.h

 /*
  * Copyright (C) 2004, 2006, 2008 Apple 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 27 matching lines @@
 
 namespace blink {
 
 class Element;
 class Node;
 class LayoutObject;
 class Text;
 enum class TextAffinity;
 class TreeScope;
 
-enum class PositionMoveType {
-    CodePoint, // Move by a single code point.
-    Character, // Move to the next Unicode character break.
-    BackwardDeletion // Subject to platform conventions.
-};
-
 enum class PositionAnchorType : unsigned {
     OffsetInAnchor,
     BeforeAnchor,
     AfterAnchor,
     BeforeChildren,
     AfterChildren,
 };
 
 // Instances of |PositionAlgorithm<Strategy>| are immutable.
 template <typename Strategy>
@@ skipping 325 matching lines @@
 {
     return position;
 }
 
 template <>
 inline PositionInComposedTree fromPositionInDOMTree<EditingInComposedTreeStrategy>(const Position& position)
 {
     return toPositionInComposedTree(position);
 }
 
-// TODO(yosin) We should move |previousPositionOf()| and |nextPositionOf()|
-// to "EditingUtilities.h" with |uncheckedPreviousOffset()| and
-// |uncheckedNextOffset()|.
-// Move up or down the DOM by one position.
-// Offsets are computed using layout text for nodes that have layoutObjects -
-// but note that even when using composed characters, the result may be inside
-// a single user-visible character if a ligature is formed.
-CORE_EXPORT Position previousPositionOf(const Position&, PositionMoveType);
-CORE_EXPORT Position nextPositionOf(const Position&, PositionMoveType);
-CORE_EXPORT PositionInComposedTree previousPositionOf(const PositionInComposedTree&, PositionMoveType);
-CORE_EXPORT PositionInComposedTree nextPositionOf(const PositionInComposedTree&, PositionMoveType);
-
-CORE_EXPORT int uncheckedPreviousOffset(const Node*, int current);
-CORE_EXPORT int uncheckedNextOffset(const Node*, int current);
-
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const blink::Position&);
 void showTree(const blink::Position*);
 #endif
 
 #endif // Position_h