Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/platform/graphics/GraphicsLayer.h

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 334 matching lines @@
     // We don't have ownership of m_contentsLayer, but we do want to know if a given layer is the
     // same as our current layer in setContentsTo(). Since m_contentsLayer may be deleted at this point,
     // we stash an ID away when we know m_contentsLayer is alive and use that for comparisons from that point
     // on.
     int m_contentsLayerId;
 
     Vector<LinkHighlight*> m_linkHighlights;
 
     OwnPtr<ContentLayerDelegate> m_contentLayerDelegate;
 
-    RawPtrWillBeWeakPersistent<ScrollableArea> m_scrollableArea;
+    WeakPersistent<ScrollableArea> m_scrollableArea;
     GraphicsLayerDebugInfo m_debugInfo;
     int m_3dRenderingContext;
 
     OwnPtr<PaintController> m_paintController;
 
     IntRect m_previousInterestRect;
 };
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the blink namespace for ease of invocation from gdb.
 void PLATFORM_EXPORT showGraphicsLayerTree(const blink::GraphicsLayer*);
 #endif
 
 #endif // GraphicsLayer_h