Use TreeScope::completeURL and baseURL instead of the Document versions

Source/core/css/resolver/StyleResolverState.h

Index: Source/core/css/resolver/StyleResolverState.h
diff --git a/Source/core/css/resolver/StyleResolverState.h b/Source/core/css/resolver/StyleResolverState.h
index 18095bd28dd93d9a5515eb82ccbedf770c0f6518..a4f7171b36d1e14bd98f93139d0ae8aa8c059a2c 100644
--- a/Source/core/css/resolver/StyleResolverState.h
+++ b/Source/core/css/resolver/StyleResolverState.h
@@ -31,7 +31,9 @@
 #include "core/css/resolver/ElementResolveContext.h"
 #include "core/css/resolver/ElementStyleResources.h"
 #include "core/css/resolver/FontBuilder.h"
+#include "core/dom/Document.h"
 #include "core/dom/Element.h"
+#include "core/dom/TreeScope.h"
 #include "core/rendering/style/CachedUAStyle.h"
 #include "core/rendering/style/RenderStyle.h"
 #include "core/rendering/style/StyleInheritedData.h"
@@ -45,11 +47,12 @@ class StyleRule;
 class StyleResolverState {
 WTF_MAKE_NONCOPYABLE(StyleResolverState);
 public:
-    StyleResolverState(Document&, Element*, RenderStyle* parentStyle = 0, RenderRegion* regionForStyling = 0);
+    StyleResolverState(TreeScope&, Element*, RenderStyle* parentStyle = 0, RenderRegion* regionForStyling = 0);
 
     // In FontFaceSet and CanvasRenderingContext2D, we don't have an element to grab the document from.
     // This is why we have to store the document separately.
-    Document& document() const { return m_document; }
+    Document& document() const { return m_treeScope.document(); }
+    TreeScope& treeScope() const { return m_treeScope; }
     // These are all just pass-through methods to ElementResolveContext.
     Element* element() const { return m_elementContext.element(); }
     const ContainerNode* parentNode() const { return m_elementContext.parentNode(); }
@@ -136,7 +139,7 @@ private:
     friend class StyleResolveScope;
 
     ElementResolveContext m_elementContext;
-    Document& m_document;
+    TreeScope& m_treeScope;
 
     // m_style is the primary output for each element's style resolve.
     RefPtr<RenderStyle> m_style;