Oilpan: Remove most WillBe types from the code base

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

Index: third_party/WebKit/Source/core/html/shadow/SpinButtonElement.h
diff --git a/third_party/WebKit/Source/core/html/shadow/SpinButtonElement.h b/third_party/WebKit/Source/core/html/shadow/SpinButtonElement.h
index 4be7353d262485f05bb7e92cf9a8bcf850d13f01..14f8439b9f3c647f9e374082615cde3e9e0147cf 100644
--- a/third_party/WebKit/Source/core/html/shadow/SpinButtonElement.h
+++ b/third_party/WebKit/Source/core/html/shadow/SpinButtonElement.h
@@ -45,7 +45,7 @@ public:
         EventDispatchAllowed,
         EventDispatchDisallowed,
     };
-    class SpinButtonOwner : public WillBeGarbageCollectedMixin {
+    class SpinButtonOwner : public GarbageCollectedMixin {
     public:
         virtual ~SpinButtonOwner() { }
         virtual void focusAndSelectSpinButtonOwner() = 0;
@@ -59,7 +59,7 @@ public:
     // The owner of SpinButtonElement must call removeSpinButtonOwner
     // because SpinButtonElement can be outlive SpinButtonOwner
     // implementation, e.g. during event handling.
-    static PassRefPtrWillBeRawPtr<SpinButtonElement> create(Document&, SpinButtonOwner&);
+    static RawPtr<SpinButtonElement> create(Document&, SpinButtonOwner&);
     UpDownState getUpDownState() const { return m_upDownState; }
     void releaseCapture(EventDispatch = EventDispatchAllowed);
     void removeSpinButtonOwner() { m_spinButtonOwner = nullptr; }
@@ -91,7 +91,7 @@ private:
     bool shouldRespondToMouseEvents();
     bool isMouseFocusable() const override { return false; }
 
-    RawPtrWillBeMember<SpinButtonOwner> m_spinButtonOwner;
+    Member<SpinButtonOwner> m_spinButtonOwner;
     bool m_capturing;
     UpDownState m_upDownState;
     UpDownState m_pressStartingState;