Revert of Oilpan: Trace CSSFontFaceSrcValue::m_svgFontFaceElement....

Revert of Oilpan: Trace CSSFontFaceSrcValue::m_svgFontFaceElement. (https://codereview.chromium.org/333403004/)

Reason for revert:
This patch leaks svg-font-face-leak-document test

http://test-results.appspot.com/dashboards/flakiness_dashboard.html#group=%40ToT%20Blink&tests=svg/svg-font-face-leak-document.html

Original issue's description:
> Oilpan: Trace CSSFontFaceSrcValue::m_svgFontFaceElement.
> 
> BUG=357163
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=176270

BUG=357163

Review URL: https://codereview.chromium.org/337703004

git-svn-id: svn://svn.chromium.org/blink/trunk@176299 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/css/CSSFontFaceSrcValue.cpp

@@ -39,14 +39,6 @@
 
 namespace WebCore {
 
-void CSSFontFaceSrcValue::traceAfterDispatch(Visitor* visitor)
-{
-#if ENABLE(SVG_FONTS)
-    visitor->trace(m_svgFontFaceElement);
-#endif
-    CSSValue::traceAfterDispatch(visitor);
-}
-
 #if ENABLE(SVG_FONTS)
 bool CSSFontFaceSrcValue::isSVGFontFaceSrc() const
 {

third_party/WebKit/Source/core/css/CSSFontFaceSrcValue.h

@@ -73,7 +73,7 @@ public:
 
     bool equals(const CSSFontFaceSrcValue&) const;
 
-    void traceAfterDispatch(Visitor*);
+    void traceAfterDispatch(Visitor* visitor) { CSSValue::traceAfterDispatch(visitor); }
 
 private:
     CSSFontFaceSrcValue(const String& resource, bool local)
@@ -81,7 +81,7 @@ private:
         , m_resource(resource)
         , m_isLocal(local)
 #if ENABLE(SVG_FONTS)
-        , m_svgFontFaceElement(nullptr)
+        , m_svgFontFaceElement(0)
 #endif
     {
     }
@@ -97,7 +97,7 @@ private:
     ResourcePtr<FontResource> m_fetched;
 
 #if ENABLE(SVG_FONTS)
-    RawPtrWillBeMember<SVGFontFaceElement> m_svgFontFaceElement;
+    SVGFontFaceElement* m_svgFontFaceElement;
 #endif
 };