Oilpan: Remove most WillBe types from the code base

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

Index: third_party/WebKit/Source/core/svg/SVGURIReference.h
diff --git a/third_party/WebKit/Source/core/svg/SVGURIReference.h b/third_party/WebKit/Source/core/svg/SVGURIReference.h
index b676bd33a1b6a394bf5786108b4f210598539907..5b2a10455395e284ac2b14f55f83f56b1a395cff 100644
--- a/third_party/WebKit/Source/core/svg/SVGURIReference.h
+++ b/third_party/WebKit/Source/core/svg/SVGURIReference.h
@@ -30,7 +30,7 @@ namespace blink {
 
 class Element;
 
-class CORE_EXPORT SVGURIReference : public WillBeGarbageCollectedMixin {
+class CORE_EXPORT SVGURIReference : public GarbageCollectedMixin {
 public:
     virtual ~SVGURIReference() { }
 
@@ -62,7 +62,7 @@ protected:
     explicit SVGURIReference(SVGElement*);
 
 private:
-    RefPtrWillBeMember<SVGAnimatedString> m_href;
+    Member<SVGAnimatedString> m_href;
 };
 
 } // namespace blink