Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/html/track/vtt/VTTRegion.h

Index: third_party/WebKit/Source/core/html/track/vtt/VTTRegion.h
diff --git a/third_party/WebKit/Source/core/html/track/vtt/VTTRegion.h b/third_party/WebKit/Source/core/html/track/vtt/VTTRegion.h
index 437fe54159adfabdb73817d72787983e35382e0d..39df53cd101ca2096d551a5657c8b07a4a5b69be 100644
--- a/third_party/WebKit/Source/core/html/track/vtt/VTTRegion.h
+++ b/third_party/WebKit/Source/core/html/track/vtt/VTTRegion.h
@@ -89,9 +89,9 @@ public:
 
     bool isScrollingRegion() { return m_scroll; }
 
-    PassRefPtrWillBeRawPtr<HTMLDivElement> getDisplayTree(Document&);
+    RawPtr<HTMLDivElement> getDisplayTree(Document&);
 
-    void appendVTTCueBox(PassRefPtrWillBeRawPtr<VTTCueBox>);
+    void appendVTTCueBox(RawPtr<VTTCueBox>);
     void displayLastVTTCueBox();
     void willRemoveVTTCueBox(VTTCueBox*);
 
@@ -133,8 +133,8 @@ private:
 
     // The cue container is the container that is scrolled up to obtain the
     // effect of scrolling cues when this is enabled for the regions.
-    RefPtrWillBeMember<HTMLDivElement> m_cueContainer;
-    RefPtrWillBeMember<HTMLDivElement> m_regionDisplayTree;
+    Member<HTMLDivElement> m_cueContainer;
+    Member<HTMLDivElement> m_regionDisplayTree;
 
     // The member variable track can be a raw pointer as it will never
     // reference a destroyed TextTrack, as this member variable