Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/dom/shadow/SlotAssignment.h

Index: third_party/WebKit/Source/core/dom/shadow/SlotAssignment.h
diff --git a/third_party/WebKit/Source/core/dom/shadow/SlotAssignment.h b/third_party/WebKit/Source/core/dom/shadow/SlotAssignment.h
index eb8a78696d30825cb3efb2a217cb4db210a46b59..191cdd3d3b97c8b4e073d03dda7f14f800f94077 100644
--- a/third_party/WebKit/Source/core/dom/shadow/SlotAssignment.h
+++ b/third_party/WebKit/Source/core/dom/shadow/SlotAssignment.h
@@ -13,11 +13,11 @@ class HTMLSlotElement;
 class Node;
 class ShadowRoot;
 
-class SlotAssignment final : public NoBaseWillBeGarbageCollected<SlotAssignment> {
+class SlotAssignment final : public GarbageCollected<SlotAssignment> {
 public:
-    static PassOwnPtrWillBeRawPtr<SlotAssignment> create()
+    static RawPtr<SlotAssignment> create()
     {
-        return adoptPtrWillBeNoop(new SlotAssignment);
+        return (new SlotAssignment);
     }
 
     HTMLSlotElement* assignedSlotFor(const Node&) const;
@@ -29,7 +29,7 @@ private:
     SlotAssignment() { }
 
     void assign(Node&, HTMLSlotElement&);
-    WillBeHeapHashMap<RawPtrWillBeMember<Node>, RawPtrWillBeMember<HTMLSlotElement>> m_assignment;
+    HeapHashMap<Member<Node>, Member<HTMLSlotElement>> m_assignment;
 };
 
 } // namespace blink