Turn styleWillChange |newStyle| into a reference

Source/core/rendering/RenderBlockFlow.cpp

Index: Source/core/rendering/RenderBlockFlow.cpp
diff --git a/Source/core/rendering/RenderBlockFlow.cpp b/Source/core/rendering/RenderBlockFlow.cpp
index 8e86cd9c3a371df555fd7d5b3ae7a4a0cf41af42..95029c233ccf03cef1c987d1c4be8df20278dec1 100644
--- a/Source/core/rendering/RenderBlockFlow.cpp
+++ b/Source/core/rendering/RenderBlockFlow.cpp
@@ -1819,12 +1819,12 @@ void RenderBlockFlow::createFloatingObjects()
     m_floatingObjects = adoptPtr(new FloatingObjects(this, isHorizontalWritingMode()));
 }
 
-void RenderBlockFlow::styleWillChange(StyleDifference diff, const RenderStyle* newStyle)
+void RenderBlockFlow::styleWillChange(StyleDifference diff, const RenderStyle& newStyle)
 {
     RenderStyle* oldStyle = style();
     s_canPropagateFloatIntoSibling = oldStyle ? !isFloatingOrOutOfFlowPositioned() && !avoidsFloats() : false;
-    if (oldStyle && parent() && diff == StyleDifferenceLayout && oldStyle->position() != newStyle->position()
-        && containsFloats() && !isFloating() && !isOutOfFlowPositioned() && newStyle->hasOutOfFlowPosition())
+    if (oldStyle && parent() && diff == StyleDifferenceLayout && oldStyle->position() != newStyle.position()
+        && containsFloats() && !isFloating() && !isOutOfFlowPositioned() && newStyle.hasOutOfFlowPosition())
             markAllDescendantsWithFloatsForLayout();
 
     RenderBlock::styleWillChange(diff, newStyle);