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 9d932e259e6710d839d47e71b22f8a702d8624a5..e09bf7406b8f8ab6ceb1860284d88deed6eb36e2 100644
--- a/Source/core/layout/FloatingObjects.h
+++ b/Source/core/layout/FloatingObjects.h
@@ -145,8 +145,8 @@ 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; }
@@ -178,7 +178,7 @@ private:
     }
     void increaseObjectsCount(FloatingObject::Type);
     void decreaseObjectsCount(FloatingObject::Type);
-    FloatingObjectInterval intervalForFloatingObject(FloatingObject*);
+    FloatingObjectInterval intervalForFloatingObject(FloatingObject&);
 
     FloatingObjectSet m_set;
     FloatingObjectTree m_placedFloatsTree;