Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/platform/scroll/ScrollableArea.h

Index: third_party/WebKit/Source/platform/scroll/ScrollableArea.h
diff --git a/third_party/WebKit/Source/platform/scroll/ScrollableArea.h b/third_party/WebKit/Source/platform/scroll/ScrollableArea.h
index a6904b6c42c68573bdf84d914f2ea71016a9b79b..ef668ea0a35e7a57cd3fc4724094502f88cb5f13 100644
--- a/third_party/WebKit/Source/platform/scroll/ScrollableArea.h
+++ b/third_party/WebKit/Source/platform/scroll/ScrollableArea.h
@@ -62,7 +62,7 @@ enum IncludeScrollbarsInRect {
 };
 
 #if ENABLE(OILPAN)
-// Oilpan: Using the transition type WillBeGarbageCollectedMixin is
+// Oilpan: Using the transition type GarbageCollectedMixin is
 // problematic non-Oilpan as the type expands to DummyBase, exporting it
 // also from 'platform' as a result. Bringing about duplicate DummyBases
 // as core also exports same; with component build linking fails as a
@@ -335,8 +335,8 @@ private:
     virtual int documentStep(ScrollbarOrientation) const;
     virtual float pixelStep(ScrollbarOrientation) const;
 
-    mutable OwnPtrWillBeMember<ScrollAnimatorBase> m_scrollAnimator;
-    mutable OwnPtrWillBeMember<ProgrammaticScrollAnimator> m_programmaticScrollAnimator;
+    mutable Member<ScrollAnimatorBase> m_scrollAnimator;
+    mutable Member<ProgrammaticScrollAnimator> m_programmaticScrollAnimator;
 
     unsigned m_inLiveResize : 1;