Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/html/shadow/DateTimeEditElement.h

Index: third_party/WebKit/Source/core/html/shadow/DateTimeEditElement.h
diff --git a/third_party/WebKit/Source/core/html/shadow/DateTimeEditElement.h b/third_party/WebKit/Source/core/html/shadow/DateTimeEditElement.h
index 440fec91b8e292e2a0387f73e6e32834150547e9..bfc562a88672aaca12a9004c8618d141bd451407 100644
--- a/third_party/WebKit/Source/core/html/shadow/DateTimeEditElement.h
+++ b/third_party/WebKit/Source/core/html/shadow/DateTimeEditElement.h
@@ -46,12 +46,12 @@ class StepRange;
 //  - Hour, Minute, Second, Millisecond, AM/PM
 class DateTimeEditElement final : public HTMLDivElement, public DateTimeFieldElement::FieldOwner {
     WTF_MAKE_NONCOPYABLE(DateTimeEditElement);
-    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(DateTimeEditElement);
+    USING_GARBAGE_COLLECTED_MIXIN(DateTimeEditElement);
 
 public:
     // EditControlOwner implementer must call removeEditControlOwner when
     // it doesn't handle event, e.g. at destruction.
-    class EditControlOwner : public WillBeGarbageCollectedMixin {
+    class EditControlOwner : public GarbageCollectedMixin {
     public:
         virtual ~EditControlOwner();
         virtual void didBlurFromControl() = 0;
@@ -83,12 +83,12 @@ public:
         }
     };
 
-    static PassRefPtrWillBeRawPtr<DateTimeEditElement> create(Document&, EditControlOwner&);
+    static RawPtr<DateTimeEditElement> create(Document&, EditControlOwner&);
 
     ~DateTimeEditElement() override;
     DECLARE_VIRTUAL_TRACE();
 
-    void addField(PassRefPtrWillBeRawPtr<DateTimeFieldElement>);
+    void addField(RawPtr<DateTimeFieldElement>);
     bool anyEditableFieldsHaveValues() const;
     void blurByOwner();
     void defaultEventHandler(Event*) override;
@@ -152,8 +152,8 @@ private:
     AtomicString localeIdentifier() const override;
     void fieldDidChangeValueByKeyboard() override;
 
-    WillBeHeapVector<RawPtrWillBeMember<DateTimeFieldElement>, maximumNumberOfFields> m_fields;
-    RawPtrWillBeMember<EditControlOwner> m_editControlOwner;
+    HeapVector<Member<DateTimeFieldElement>, maximumNumberOfFields> m_fields;
+    Member<EditControlOwner> m_editControlOwner;
 };
 
 DEFINE_TYPE_CASTS(DateTimeEditElement, Element, element, element->isDateTimeEditElement(), element.isDateTimeEditElement());