Oilpan: Remove most WillBe types from the code base

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

Index: third_party/WebKit/Source/core/dom/ClassCollection.h
diff --git a/third_party/WebKit/Source/core/dom/ClassCollection.h b/third_party/WebKit/Source/core/dom/ClassCollection.h
index 4487fbe939636e1bcd2a4279825edc809f3ac0a1..d767b3ab012bcc730b76117b3c66e09e761edfd3 100644
--- a/third_party/WebKit/Source/core/dom/ClassCollection.h
+++ b/third_party/WebKit/Source/core/dom/ClassCollection.h
@@ -40,10 +40,10 @@ class ClassCollection final : public HTMLCollection {
 public:
     // classNames argument is an AtomicString because it is common for Elements to share the same class names.
     // It is also used to construct a SpaceSplitString (m_classNames) and its constructor requires an AtomicString.
-    static PassRefPtrWillBeRawPtr<ClassCollection> create(ContainerNode& rootNode, CollectionType type, const AtomicString& classNames)
+    static RawPtr<ClassCollection> create(ContainerNode& rootNode, CollectionType type, const AtomicString& classNames)
     {
         ASSERT_UNUSED(type, type == ClassCollectionType);
-        return adoptRefWillBeNoop(new ClassCollection(rootNode, classNames));
+        return (new ClassCollection(rootNode, classNames));
     }
 
     ~ClassCollection() override;