Oilpan: Remove most WillBe types from the code base

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

Index: third_party/WebKit/Source/core/svg/SVGViewElement.h
diff --git a/third_party/WebKit/Source/core/svg/SVGViewElement.h b/third_party/WebKit/Source/core/svg/SVGViewElement.h
index 28ead0dd2d16601fbd795dac3eabb3e816609fdd..2c76b56e7ecd45674b0c5f24221774766c194a71 100644
--- a/third_party/WebKit/Source/core/svg/SVGViewElement.h
+++ b/third_party/WebKit/Source/core/svg/SVGViewElement.h
@@ -35,7 +35,7 @@ class SVGViewElement final : public SVGElement,
                              public SVGFitToViewBox,
                              public SVGZoomAndPan {
     DEFINE_WRAPPERTYPEINFO();
-    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(SVGViewElement);
+    USING_GARBAGE_COLLECTED_MIXIN(SVGViewElement);
 public:
     DECLARE_NODE_FACTORY(SVGViewElement);
 
@@ -55,7 +55,7 @@ private:
 
     bool layoutObjectIsNeeded(const ComputedStyle&) override { return false; }
 
-    RefPtrWillBeMember<SVGStaticStringList> m_viewTarget;
+    Member<SVGStaticStringList> m_viewTarget;
 };
 
 } // namespace blink