Move computeInlineBoxPosition out from PositionAlgorithm class

Source/core/editing/VisiblePosition.h

Index: Source/core/editing/VisiblePosition.h
diff --git a/Source/core/editing/VisiblePosition.h b/Source/core/editing/VisiblePosition.h
index 83080e46246d00187f4d747349777ba3d1d8283c..05d691b0089e2c19a7add6f5556a8470ccef3d7a 100644
--- a/Source/core/editing/VisiblePosition.h
+++ b/Source/core/editing/VisiblePosition.h
@@ -142,7 +142,7 @@ private:
 // with |Position| version.
 inline InlineBoxPosition computeInlineBoxPosition(const VisiblePosition& position)
 {
-    return position.deepEquivalent().computeInlineBoxPosition(position.affinity());
+    return computeInlineBoxPosition(position.deepEquivalent(), position.affinity());
 }
 
 EphemeralRange makeRange(const VisiblePosition&, const VisiblePosition&);