Convert RenderBlockFlow code to use FloatingObject references

Source/core/layout/FloatingObjects.h

Index: Source/core/layout/FloatingObjects.h
diff --git a/Source/core/layout/FloatingObjects.h b/Source/core/layout/FloatingObjects.h
index d8b23de4d17c1503e4c8ddcc599c0b2425532ccd..718f3f8dc7773555a94d47e412c4b8d8b4966123 100644
--- a/Source/core/layout/FloatingObjects.h
+++ b/Source/core/layout/FloatingObjects.h
@@ -142,8 +142,8 @@ public:
     void moveAllToFloatInfoMap(LayoutBoxToFloatInfoMap&);
     FloatingObject* add(PassOwnPtr<FloatingObject>);
     void remove(FloatingObject*);
-    void addPlacedObject(FloatingObject*);
-    void removePlacedObject(FloatingObject*);
+    void addPlacedObject(FloatingObject&);
+    void removePlacedObject(FloatingObject&);
     void setHorizontalWritingMode(bool b = true) { m_horizontalWritingMode = b; }
 
     bool hasLeftObjects() const { return m_leftObjectsCount > 0; }
@@ -174,7 +174,7 @@ private:
     }
     void increaseObjectsCount(FloatingObject::Type);
     void decreaseObjectsCount(FloatingObject::Type);
-    FloatingObjectInterval intervalForFloatingObject(FloatingObject*);
+    FloatingObjectInterval intervalForFloatingObject(FloatingObject&);
 
     FloatingObjectSet m_set;
     FloatingObjectTree m_placedFloatsTree;