Use references in RenderBlock and RenderBlockFlow methods

Source/core/rendering/RenderBlockFlow.h

Index: Source/core/rendering/RenderBlockFlow.h
diff --git a/Source/core/rendering/RenderBlockFlow.h b/Source/core/rendering/RenderBlockFlow.h
index 7cbec609fba1d7c02fee821b6cf1d40671af93ba..b8b9bec203e9885e7cc2b796dc0ea71a0fdfd9d9 100644
--- a/Source/core/rendering/RenderBlockFlow.h
+++ b/Source/core/rendering/RenderBlockFlow.h
@@ -212,13 +212,13 @@ public:
         if (isHorizontalWritingMode())
             return child->x() + child->renderer()->marginLeft();
 
-        return child->x() + marginBeforeForChild(child->renderer());
+        return child->x() + marginBeforeForChild(*(child->renderer()));

[Julien - ping for review, 2014/11/26 18:52:35]

We should make FloatingObject return a reference too.

[Sunil Ratnu, 2014/11/27 12:02:54]

Lets keep FloatingObject conversion in a separate CL as it involves a lot of
caller sites.

     }
 
     LayoutUnit yPositionForFloatIncludingMargin(const FloatingObject* child) const
     {
         if (isHorizontalWritingMode())
-            return child->y() + marginBeforeForChild(child->renderer());
+            return child->y() + marginBeforeForChild(*(child->renderer()));
 
         return child->y() + child->renderer()->marginTop();
     }