Rendering API cleanup

Source/core/rendering/RenderTableSection.h

Index: Source/core/rendering/RenderTableSection.h
diff --git a/Source/core/rendering/RenderTableSection.h b/Source/core/rendering/RenderTableSection.h
index f87164256da1abb398944a6c6ceb01ec12b8212c..c3e1a5e5f8516d314e5ccec93a08ea93418e5778 100644
--- a/Source/core/rendering/RenderTableSection.h
+++ b/Source/core/rendering/RenderTableSection.h
@@ -52,8 +52,8 @@ public:
     unsigned start() const { return m_start; }
     unsigned end() const { return m_end; }
 
-    unsigned& start() { return m_start; }
-    unsigned& end() { return m_end; }
+    void decreaseStart() { --m_start; }
+    void increaseEnd() { ++m_end; }
 
 private:
     unsigned m_start;