Have Node::diff() take a Document reference in argument

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index fff83670193ce1dd38bab7914952d24d3abe66c2..f97b1c4a4ced5b883213d2fcc72bd1e4f38826b5 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -1654,7 +1654,7 @@ void Document::recalcStyle(StyleChange change)
             m_hasNodesWithPlaceholderStyle = false;
 
             RefPtr<RenderStyle> documentStyle = StyleResolver::styleForDocument(*this, m_styleResolver ? m_styleResolver->fontSelector() : 0);
-            StyleChange ch = Node::diff(documentStyle.get(), renderer()->style(), this);
+            StyleChange ch = Node::diff(documentStyle.get(), renderer()->style(), *this);
             if (ch != NoChange)
                 renderer()->setStyle(documentStyle.release());
         }