Make inSameLine() in VisibleUnits.cpp to work with positions in composed tree

Source/core/editing/RenderedPosition.h

Index: Source/core/editing/RenderedPosition.h
diff --git a/Source/core/editing/RenderedPosition.h b/Source/core/editing/RenderedPosition.h
index 3d602b90b5257b9a802d574894e25c7e5d63a21d..86ea30efc63166b924d483892ea9e56ae6a9b331 100644
--- a/Source/core/editing/RenderedPosition.h
+++ b/Source/core/editing/RenderedPosition.h
@@ -47,7 +47,8 @@ class RenderedPosition {
 public:
     RenderedPosition();
     explicit RenderedPosition(const VisiblePosition&);
-    explicit RenderedPosition(const Position&, EAffinity);
+    RenderedPosition(const Position&, EAffinity);
+    RenderedPosition(const PositionInComposedTree&, EAffinity);
     bool isEquivalent(const RenderedPosition&) const;
 
     bool isNull() const { return !m_layoutObject; }