Have SVGURIReference API deal with Document references, not pointers

Source/core/svg/graphics/filters/SVGFEImage.cpp

Index: Source/core/svg/graphics/filters/SVGFEImage.cpp
diff --git a/Source/core/svg/graphics/filters/SVGFEImage.cpp b/Source/core/svg/graphics/filters/SVGFEImage.cpp
index 0f2bf2c1dc6a35826a4282bd8121d56640264184..f61a702fc566ee176d130ecb09d40aa5338ec0e8 100644
--- a/Source/core/svg/graphics/filters/SVGFEImage.cpp
+++ b/Source/core/svg/graphics/filters/SVGFEImage.cpp
@@ -47,9 +47,9 @@ FEImage::FEImage(Filter* filter, PassRefPtr<Image> image, const SVGPreserveAspec
 {
 }
 
-FEImage::FEImage(Filter* filter, Document* document, const String& href, const SVGPreserveAspectRatio& preserveAspectRatio)
+FEImage::FEImage(Filter* filter, Document& document, const String& href, const SVGPreserveAspectRatio& preserveAspectRatio)
     : FilterEffect(filter)
-    , m_document(document)
+    , m_document(&document)
     , m_href(href)
     , m_preserveAspectRatio(preserveAspectRatio)
 {
@@ -60,7 +60,7 @@ PassRefPtr<FEImage> FEImage::createWithImage(Filter* filter, PassRefPtr<Image> i
     return adoptRef(new FEImage(filter, image, preserveAspectRatio));
 }
 
-PassRefPtr<FEImage> FEImage::createWithIRIReference(Filter* filter, Document* document, const String& href, const SVGPreserveAspectRatio& preserveAspectRatio)
+PassRefPtr<FEImage> FEImage::createWithIRIReference(Filter* filter, Document& document, const String& href, const SVGPreserveAspectRatio& preserveAspectRatio)
 {
     return adoptRef(new FEImage(filter, document, href, preserveAspectRatio));
 }
@@ -86,7 +86,7 @@ RenderObject* FEImage::referencedRenderer() const
 {
     if (!m_document)
         return 0;
-    Element* hrefElement = SVGURIReference::targetElementFromIRIString(m_href, m_document);
+    Element* hrefElement = SVGURIReference::targetElementFromIRIString(m_href, *m_document);
     if (!hrefElement || !hrefElement->isSVGElement())
         return 0;
     return hrefElement->renderer();