Prepare SVGDocumentExtensions::m_elementDependencies for oilpan

Source/core/svg/SVGElement.cpp

Index: Source/core/svg/SVGElement.cpp
diff --git a/Source/core/svg/SVGElement.cpp b/Source/core/svg/SVGElement.cpp
index a567999d9cafb910faacd4b635e881214b46b36a..e207545d9e128d5f1aa0a19024dea31beda3d7e1 100644
--- a/Source/core/svg/SVGElement.cpp
+++ b/Source/core/svg/SVGElement.cpp
@@ -101,7 +101,7 @@ SVGElement::~SVGElement()
     }
 
     // With Oilpan, either removedFrom has been called or the document is dead
-    // as well and there is no reason to clear out the extensions.
+    // as well and there is no reason to clear out the references.
     document().accessSVGExtensions().rebuildAllElementReferencesForTarget(this);
     document().accessSVGExtensions().removeAllElementReferencesForTarget(this);
 #endif