Oilpan: Remove most WillBe types from the code base

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

Index: third_party/WebKit/Source/core/svg/SVGMaskElement.h
diff --git a/third_party/WebKit/Source/core/svg/SVGMaskElement.h b/third_party/WebKit/Source/core/svg/SVGMaskElement.h
index 2bae142be835a36708ae190ff70856ab8ea2c3f2..6e482f8893321b951b4fb58451fbaa51af5526a7 100644
--- a/third_party/WebKit/Source/core/svg/SVGMaskElement.h
+++ b/third_party/WebKit/Source/core/svg/SVGMaskElement.h
@@ -34,7 +34,7 @@ namespace blink {
 class SVGMaskElement final : public SVGElement,
                              public SVGTests {
     DEFINE_WRAPPERTYPEINFO();
-    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(SVGMaskElement);
+    USING_GARBAGE_COLLECTED_MIXIN(SVGMaskElement);
 public:
     DECLARE_NODE_FACTORY(SVGMaskElement);
 
@@ -63,12 +63,12 @@ private:
 
     bool selfHasRelativeLengths() const override;
 
-    RefPtrWillBeMember<SVGAnimatedLength> m_x;
-    RefPtrWillBeMember<SVGAnimatedLength> m_y;
-    RefPtrWillBeMember<SVGAnimatedLength> m_width;
-    RefPtrWillBeMember<SVGAnimatedLength> m_height;
-    RefPtrWillBeMember<SVGAnimatedEnumeration<SVGUnitTypes::SVGUnitType>> m_maskUnits;
-    RefPtrWillBeMember<SVGAnimatedEnumeration<SVGUnitTypes::SVGUnitType>> m_maskContentUnits;
+    Member<SVGAnimatedLength> m_x;
+    Member<SVGAnimatedLength> m_y;
+    Member<SVGAnimatedLength> m_width;
+    Member<SVGAnimatedLength> m_height;
+    Member<SVGAnimatedEnumeration<SVGUnitTypes::SVGUnitType>> m_maskUnits;
+    Member<SVGAnimatedEnumeration<SVGUnitTypes::SVGUnitType>> m_maskContentUnits;
 };
 
 } // namespace blink