Remove side-effects from the SVGTreeScopeResources constructor

third_party/WebKit/Source/core/svg/SVGTreeScopeResources.cpp

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/svg/SVGTreeScopeResources.h"
 
 #include "core/dom/Element.h"
 #include "core/dom/TreeScope.h"
 #include "core/layout/svg/LayoutSVGResourceContainer.h"
 #include "core/layout/svg/SVGResourcesCache.h"
 #include "core/svg/SVGUseElement.h"
 #include "wtf/text/AtomicString.h"
 
 namespace blink {
 
 SVGTreeScopeResources::SVGTreeScopeResources(TreeScope* treeScope)
-    : m_treeScope(treeScope) {
-  // Whenever an object of SVGTreeScopeResources is created, to keep the code
-  // behave as before,
-  // the document should also have an instance of SVGDocumentExtensions created.
-  // Thus below line is added.
-  treeScope->document().accessSVGExtensions();
-}
+    : m_treeScope(treeScope) {}
 
 SVGTreeScopeResources::~SVGTreeScopeResources() = default;
 
 static LayoutSVGResourceContainer* lookupResource(TreeScope& treeScope,
                                                   const AtomicString& id) {
   Element* element = treeScope.getElementById(id);
   if (!element)
     return nullptr;
   LayoutObject* layoutObject = element->layoutObject();
   if (!layoutObject || !layoutObject->isSVGResourceContainer())
@@ skipping 195 matching lines @@
 
     clearHasPendingResourcesIfPossible(*clientElement);
   }
 }
 
 DEFINE_TRACE(SVGTreeScopeResources) {
   visitor->trace(m_pendingResources);
   visitor->trace(m_treeScope);
 }
 }