Move a member function inRenderedText() out from PositionAlgorithm template 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 d0f15997a9c45d9c9d219690e0b1e3e896f3b871..1c4fabf06168a6e629e49ceef6920dd0f4cdb1fb 100644
--- a/Source/core/editing/Position.h
+++ b/Source/core/editing/Position.h
@@ -190,7 +190,6 @@ public:
     PositionAlgorithm<Strategy> downstream(EditingBoundaryCrossingRule = CannotCrossEditingBoundary) const;
 
     bool isCandidate() const;
-    bool inRenderedText() const;
 
     InlineBoxPosition computeInlineBoxPosition(TextAffinity) const;
     InlineBoxPosition computeInlineBoxPosition(TextAffinity, TextDirection primaryDirection) const;
@@ -448,6 +447,11 @@ inline PositionInComposedTree fromPositionInDOMTree<EditingInComposedTreeStrateg
 // to "VisibleUnits.cpp" to reduce |LayoutObject| dependency in "Position.cpp"
 bool hasRenderedNonAnonymousDescendantsWithHeight(LayoutObject*);
 
+// TODO(yosin) We should move |inRenderedText()| to "VisibleUnits.h" for
+// reduce dependency of |LayoutObject| in |Position| class.
+CORE_EXPORT bool inRenderedText(const Position&);
+CORE_EXPORT bool inRenderedText(const PositionInComposedTree&);
+
 } // namespace blink
 
 #ifndef NDEBUG