Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/dom/DatasetDOMStringMap.h

Index: third_party/WebKit/Source/core/dom/DatasetDOMStringMap.h
diff --git a/third_party/WebKit/Source/core/dom/DatasetDOMStringMap.h b/third_party/WebKit/Source/core/dom/DatasetDOMStringMap.h
index 035b313615cda2e951ef74cd7c60377e8c45dacd..7c238fd17b339f7721795b293c979289afdbce43 100644
--- a/third_party/WebKit/Source/core/dom/DatasetDOMStringMap.h
+++ b/third_party/WebKit/Source/core/dom/DatasetDOMStringMap.h
@@ -36,9 +36,9 @@ class ExceptionState;
 
 class DatasetDOMStringMap final : public DOMStringMap {
 public:
-    static PassOwnPtrWillBeRawPtr<DatasetDOMStringMap> create(Element* element)
+    static RawPtr<DatasetDOMStringMap> create(Element* element)
     {
-        return adoptPtrWillBeNoop(new DatasetDOMStringMap(element));
+        return new DatasetDOMStringMap(element);
     }
 
 #if !ENABLE(OILPAN)
@@ -62,7 +62,7 @@ private:
     {
     }
 
-    RawPtrWillBeMember<Element> m_element;
+    Member<Element> m_element;
 };
 
 } // namespace blink