Move computeInlineBoxPosition out from PositionAlgorithm class

Source/core/editing/Position.h

Index: Source/core/editing/Position.h
diff --git a/Source/core/editing/Position.h b/Source/core/editing/Position.h
index 6dd1d1093669eab44dc20220cf7e2c0a97f67c6f..d176e728d080fdc7994e5644baeaa3c60822959f 100644
--- a/Source/core/editing/Position.h
+++ b/Source/core/editing/Position.h
@@ -189,9 +189,6 @@ public:
 
     bool isCandidate() const;
 
-    InlineBoxPosition computeInlineBoxPosition(TextAffinity) const;
-    InlineBoxPosition computeInlineBoxPosition(TextAffinity, TextDirection primaryDirection) const;
-
     static PositionAlgorithm<Strategy> beforeNode(Node* anchorNode);
     static PositionAlgorithm<Strategy> afterNode(Node* anchorNode);
     static PositionAlgorithm<Strategy> inParentBeforeNode(const Node& anchorNode);
@@ -433,6 +430,17 @@ inline PositionInComposedTree fromPositionInDOMTree<EditingInComposedTreeStrateg
     return toPositionInComposedTree(position);
 }
 
+// TODO(yosin) |isRenderedCharacter()| should be removed, and we should use
+// |VisiblePosition::characterAfter()| and |VisiblePosition::characterBefore()|.
+// TODO(yosin) We should move |isRenderedCharacter()| to "VisibleUnits.cpp",
+// since it is used only in "editing/commands/"
+CORE_EXPORT bool isRenderedCharacter(const Position&);
+// TODO(yosin) We should move |computeInlineBoxPosition()| to "VisibleUnits.cpp"
+CORE_EXPORT InlineBoxPosition computeInlineBoxPosition(const Position&, TextAffinity);
+CORE_EXPORT InlineBoxPosition computeInlineBoxPosition(const Position&, TextAffinity, TextDirection primaryDirection);
+CORE_EXPORT InlineBoxPosition computeInlineBoxPosition(const PositionInComposedTree&, TextAffinity);
+CORE_EXPORT InlineBoxPosition computeInlineBoxPosition(const PositionInComposedTree&, TextAffinity, TextDirection primaryDirection);
+
 // TODO(yosin) We should move |inRenderedText()| to "VisibleUnits.h" for
 // reduce dependency of |LayoutObject| in |Position| class.
 CORE_EXPORT bool inRenderedText(const Position&);