Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/css/SelectorFilter.h

Index: third_party/WebKit/Source/core/css/SelectorFilter.h
diff --git a/third_party/WebKit/Source/core/css/SelectorFilter.h b/third_party/WebKit/Source/core/css/SelectorFilter.h
index 3adbeeff62bbb091d2873832e9107772b481df8f..04a586e9387bdbad00def87002029073c0d06665 100644
--- a/third_party/WebKit/Source/core/css/SelectorFilter.h
+++ b/third_party/WebKit/Source/core/css/SelectorFilter.h
@@ -48,7 +48,7 @@ public:
 
         DECLARE_TRACE();
 
-        RawPtrWillBeMember<Element> element;
+        Member<Element> element;
         Vector<unsigned, 4> identifierHashes;
     };
 
@@ -67,7 +67,7 @@ private:
     void pushParentStackFrame(Element& parent);
     void popParentStackFrame();
 
-    WillBeHeapVector<ParentStackFrame> m_parentStack;
+    HeapVector<ParentStackFrame> m_parentStack;
 
     // With 100 unique strings in the filter, 2^12 slot table has false positive rate of ~0.2%.
     using IdentifierFilter = BloomFilter<12>;