Oilpan: fix build after r191383 (93780455).

Source/core/frame/FrameViewAutoSizeInfo.h

Index: Source/core/frame/FrameViewAutoSizeInfo.h
diff --git a/Source/core/frame/FrameViewAutoSizeInfo.h b/Source/core/frame/FrameViewAutoSizeInfo.h
index d022b4cf3fb1f16d33a9b83c23aab153522c6123..7ef98e56f688ecadc29936afc9d938064733538c 100644
--- a/Source/core/frame/FrameViewAutoSizeInfo.h
+++ b/Source/core/frame/FrameViewAutoSizeInfo.h
@@ -18,6 +18,7 @@ class FrameView;
 class FrameViewAutoSizeInfo final : public NoBaseWillBeGarbageCollected<FrameViewAutoSizeInfo> {
     WTF_MAKE_NONCOPYABLE(FrameViewAutoSizeInfo);
     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
+    DECLARE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(FrameViewAutoSizeInfo);
 public:
     static PassOwnPtrWillBeRawPtr<FrameViewAutoSizeInfo> create(FrameView* frameView)
     {
@@ -27,10 +28,12 @@ public:
     void configureAutoSizeMode(const IntSize& minSize, const IntSize& maxSize);
     void autoSizeIfNeeded();
 
+    DECLARE_TRACE();
+
 private:
     explicit FrameViewAutoSizeInfo(FrameView*);
 
-    FrameView* m_frameView;
+    RawPtrWillBeMember<FrameView> m_frameView;
 
     // The lower bound on the size when autosizing.
     IntSize m_minAutoSize;