Oilpan: |SVGViewSpec::m_contextElement| should be a member.

r175772 changed lifetime of SVGViewSpec to be always same as SVGSVGElement,
so this weak-ref can now be made a strong-ref.

BUG=357163

Review URL: https://codereview.chromium.org/331583002

git-svn-id: svn://svn.chromium.org/blink/trunk@176001 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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

@@ -214,13 +214,7 @@ bool SVGViewSpec::parseViewSpecInternal(const CharType* ptr, const CharType* end
 
 void SVGViewSpec::trace(Visitor* visitor)
 {
-    visitor->registerWeakMembers<SVGViewSpec, &SVGViewSpec::clearWeakMembers>(this);
-}
-
-void SVGViewSpec::clearWeakMembers(Visitor* visitor)
-{
-    if (!visitor->isAlive(m_contextElement))
-        detachContextElement();
+    visitor->trace(m_contextElement);
 }
 
 }

third_party/WebKit/Source/core/svg/SVGViewSpec.h

@@ -58,7 +58,6 @@ public:
     void setZoomAndPan(unsigned short value, ExceptionState&);
 
     void trace(Visitor*);
-    void clearWeakMembers(Visitor*);
 
     SVGSVGElement* contextElement() { return m_contextElement.get(); }
 
@@ -68,7 +67,7 @@ private:
     template<typename CharType>
     bool parseViewSpecInternal(const CharType* ptr, const CharType* end);
 
-    RawPtrWillBeWeakMember<SVGSVGElement> m_contextElement;
+    RawPtrWillBeMember<SVGSVGElement> m_contextElement;
     RefPtr<SVGAnimatedTransformList> m_transform;
     String m_viewTargetString;
 };