Oilpan: Remove most WillBe types from the code base

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

Index: third_party/WebKit/Source/platform/scroll/ScrollableArea.cpp
diff --git a/third_party/WebKit/Source/platform/scroll/ScrollableArea.cpp b/third_party/WebKit/Source/platform/scroll/ScrollableArea.cpp
index 6d5b7a1d6413667c0cf6b8b610cbe2324d75243e..09caa91df182596ba748fb2bfe963a8e3686ae21 100644
--- a/third_party/WebKit/Source/platform/scroll/ScrollableArea.cpp
+++ b/third_party/WebKit/Source/platform/scroll/ScrollableArea.cpp
@@ -53,7 +53,7 @@ struct SameSizeAsScrollableArea {
 #if ENABLE(ASSERT) && ENABLE(OILPAN)
     VerifyEagerFinalization verifyEager;
 #endif
-    OwnPtrWillBeMember<void*> pointer[2];
+    Member<void*> pointer[2];
     unsigned bitfields : 16;
     IntPoint origin;
 };