Have Document::accessSVGExtensions() return a reference

Source/core/svg/SVGUseElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.
  * Copyright (C) 2011 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  * Copyright (C) 2012 University of Szeged
  * Copyright (C) 2012 Renata Hodovan <reni@webkit.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 356 matching lines @@
         shadowTreeRootElement->removeChildren();
 
     if (m_targetElementInstance) {
         m_targetElementInstance->detach();
         m_targetElementInstance = nullptr;
     }
 
     m_needsShadowTreeRecreation = false;
     document().unscheduleUseShadowTreeUpdate(*this);
 
-    document().accessSVGExtensions()->removeAllTargetReferencesForElement(this);
+    document().accessSVGExtensions().removeAllTargetReferencesForElement(this);
 }
 
 void SVGUseElement::buildPendingResource()
 {
     if (!referencedDocument() || isInShadowTree())
         return;
     clearResourceReferences();
     if (!inDocument())
         return;
 
     AtomicString id;
     Element* target = SVGURIReference::targetElementFromIRIString(hrefString(), document(), &id, externalDocument());
     if (!target || !target->inDocument()) {
         // If we can't find the target of an external element, just give up.
         // We can't observe if the target somewhen enters the external document, nor should we do it.
         if (externalDocument())
             return;
         if (id.isEmpty())
             return;
 
-        referencedDocument()->accessSVGExtensions()->addPendingResource(id, this);
+        referencedDocument()->accessSVGExtensions().addPendingResource(id, this);
         ASSERT(hasPendingResources());
         return;
     }
 
     if (target->isSVGElement()) {
         buildShadowAndInstanceTree(toSVGElement(target));
         invalidateDependentShadowTrees();
     }
 
     ASSERT(!m_needsShadowTreeRecreation);
@@ skipping 118 matching lines @@
 {
     ASSERT(path.isEmpty());
 
     Node* n = m_targetElementInstance ? m_targetElementInstance->shadowTreeElement() : 0;
     if (!n)
         return;
 
     if (n->isSVGElement() && toSVGElement(n)->isSVGGraphicsElement()) {
         if (!isDirectReference(n)) {
             // Spec: Indirect references are an error (14.3.5)
-            document().accessSVGExtensions()->reportError("Not allowed to use indirect reference in <clip-path>");
+            document().accessSVGExtensions().reportError("Not allowed to use indirect reference in <clip-path>");
         } else {
             toSVGGraphicsElement(n)->toClipPath(path);
             // FIXME: Avoid manual resolution of x/y here. Its potentially harmful.
             SVGLengthContext lengthContext(this);
             path.translate(FloatSize(m_x->currentValue()->value(lengthContext), m_y->currentValue()->value(lengthContext)));
             path.transform(animatedLocalTransform());
         }
     }
 }
 
@@ skipping 19 matching lines @@
     bool targetHasUseTag = target->hasTagName(SVGNames::useTag);
     SVGElement* newTarget = 0;
     if (targetHasUseTag) {
         foundProblem = hasCycleUseReferencing(toSVGUseElement(target), targetInstance, newTarget);
         if (foundProblem)
             return;
 
         // We only need to track first degree <use> dependencies. Indirect references are handled
         // as the invalidation bubbles up the dependency chain.
         if (!foundUse) {
-            document().accessSVGExtensions()->addElementReferencingTarget(this, target);
+            document().accessSVGExtensions().addElementReferencingTarget(this, target);
             foundUse = true;
         }
     } else if (isDisallowedElement(target)) {
         foundProblem = true;
         return;
     }
 
     // A general description from the SVG spec, describing what buildInstanceTree() actually does.
     //
     // Spec: If the 'use' element references a 'g' which contains two 'rect' elements, then the instance tree
@@ skipping 393 matching lines @@
 
     if (m_resource)
         m_resource->removeClient(this);
 
     m_resource = resource;
     if (m_resource)
         m_resource->addClient(this);
 }
 
 }