Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/loader/FrameFetchContext.h

Index: third_party/WebKit/Source/core/loader/FrameFetchContext.h
diff --git a/third_party/WebKit/Source/core/loader/FrameFetchContext.h b/third_party/WebKit/Source/core/loader/FrameFetchContext.h
index 4410b911845aea0ac45c6f77f4f15b13096c65c8..d0c00dc164d37d24522531f36f8bdb800fc00712 100644
--- a/third_party/WebKit/Source/core/loader/FrameFetchContext.h
+++ b/third_party/WebKit/Source/core/loader/FrameFetchContext.h
@@ -127,8 +127,8 @@ private:
     // FIXME: Oilpan: Ideally this should just be a traced Member but that will
     // currently leak because ComputedStyle and its data are not on the heap.
     // See crbug.com/383860 for details.
-    RawPtrWillBeWeakMember<Document> m_document;
-    RawPtrWillBeMember<DocumentLoader> m_documentLoader;
+    WeakMember<Document> m_document;
+    Member<DocumentLoader> m_documentLoader;
 
     bool m_imageFetched : 1;
 };