Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/paint/PaintLayer.cpp

Index: third_party/WebKit/Source/core/paint/PaintLayer.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintLayer.cpp b/third_party/WebKit/Source/core/paint/PaintLayer.cpp
index 02f40fbc8e3eec86471d78e74fd9cdc5292aa228..2c14b1c62f0e25952c0def46b4261e0b7e0ae590 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayer.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintLayer.cpp
@@ -102,7 +102,7 @@ struct SameSizeAsPaintLayer : DisplayItemClient {
     void* pointers[9];
     LayoutUnit layoutUnits[4];
     IntSize size;
-    OwnPtrWillBePersistent<PaintLayerScrollableArea> scrollableArea;
+    Persistent<PaintLayerScrollableArea> scrollableArea;
     struct {
         IntRect rect;
         void* pointers[2];
@@ -2591,7 +2591,7 @@ FilterOperations computeFilterOperationsHandleReferenceFilters(const FilterOpera
                 continue;
             ReferenceFilterOperation& referenceOperation = toReferenceFilterOperation(*filterOperation);
             // FIXME: Cache the Filter if it didn't change.
-            RefPtrWillBeRawPtr<Filter> referenceFilter = ReferenceFilterBuilder::build(effectiveZoom, toElement(enclosingNode), nullptr, referenceOperation);
+            RawPtr<Filter> referenceFilter = ReferenceFilterBuilder::build(effectiveZoom, toElement(enclosingNode), nullptr, referenceOperation);
             referenceOperation.setFilter(referenceFilter.release());
         }
     }