Have Node::document() return a reference instead of a pointer

Source/core/svg/SVGFEImageElement.cpp

Index: Source/core/svg/SVGFEImageElement.cpp
diff --git a/Source/core/svg/SVGFEImageElement.cpp b/Source/core/svg/SVGFEImageElement.cpp
index c1d0e37630bb6153d70ae749197c7529e97fb1e2..652dad3dc0a28ec7294a87ae3fdd3d2bd377b301 100644
--- a/Source/core/svg/SVGFEImageElement.cpp
+++ b/Source/core/svg/SVGFEImageElement.cpp
@@ -73,14 +73,13 @@ void SVGFEImageElement::clearResourceReferences()
         m_cachedImage = 0;
     }
 
-    ASSERT(document());
-    document()->accessSVGExtensions()->removeAllTargetReferencesForElement(this);
+    document().accessSVGExtensions()->removeAllTargetReferencesForElement(this);
 }
 
 void SVGFEImageElement::fetchImageResource()
 {
     FetchRequest request(ResourceRequest(ownerDocument()->completeURL(hrefCurrentValue())), localName());
-    m_cachedImage = document()->fetcher()->fetchImage(request);
+    m_cachedImage = document().fetcher()->fetchImage(request);
 
     if (m_cachedImage)
         m_cachedImage->addClient(this);
@@ -93,18 +92,18 @@ void SVGFEImageElement::buildPendingResource()
         return;
 
     String id;
-    Element* target = SVGURIReference::targetElementFromIRIString(hrefCurrentValue(), document(), &id);
+    Element* target = SVGURIReference::targetElementFromIRIString(hrefCurrentValue(), &document(), &id);
     if (!target) {
         if (id.isEmpty())
             fetchImageResource();
         else {
-            document()->accessSVGExtensions()->addPendingResource(id, this);
+            document().accessSVGExtensions()->addPendingResource(id, this);
             ASSERT(hasPendingResources());
         }
     } else if (target->isSVGElement()) {
         // Register us with the target in the dependencies map. Any change of hrefElement
         // that leads to relayout/repainting now informs us, so we can react to it.
-        document()->accessSVGExtensions()->addElementReferencingTarget(this, toSVGElement(target));
+        document().accessSVGExtensions()->addElementReferencingTarget(this, toSVGElement(target));
     }
 
     invalidate();
@@ -201,14 +200,14 @@ PassRefPtr<FilterEffect> SVGFEImageElement::build(SVGFilterBuilder*, Filter* fil
 {
     if (m_cachedImage)
         return FEImage::createWithImage(filter, m_cachedImage->imageForRenderer(renderer()), preserveAspectRatioCurrentValue());
-    return FEImage::createWithIRIReference(filter, document(), hrefCurrentValue(), preserveAspectRatioCurrentValue());
+    return FEImage::createWithIRIReference(filter, &document(), hrefCurrentValue(), preserveAspectRatioCurrentValue());
 }
 
 void SVGFEImageElement::addSubresourceAttributeURLs(ListHashSet<KURL>& urls) const
 {
     SVGFilterPrimitiveStandardAttributes::addSubresourceAttributeURLs(urls);
 
-    addSubresourceURL(urls, document()->completeURL(hrefCurrentValue()));
+    addSubresourceURL(urls, document().completeURL(hrefCurrentValue()));
 }
 
 }