Oilpan: have Navigator and its supplements be on the heap by default.

Source/modules/credentialmanager/NavigatorCredentials.h

Index: Source/modules/credentialmanager/NavigatorCredentials.h
diff --git a/Source/modules/credentialmanager/NavigatorCredentials.h b/Source/modules/credentialmanager/NavigatorCredentials.h
index 60b2f998caf44e9e8cc70ad37c150b7dfce73f45..a0177d9e030f1d55aed530cc9bb57f072976e424 100644
--- a/Source/modules/credentialmanager/NavigatorCredentials.h
+++ b/Source/modules/credentialmanager/NavigatorCredentials.h
@@ -15,12 +15,12 @@ namespace blink {
 class CredentialsContainer;
 class Navigator;
 
-class NavigatorCredentials final : public NoBaseWillBeGarbageCollected<NavigatorCredentials>, public WillBeHeapSupplement<Navigator>, public DOMWindowProperty {
-    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(NavigatorCredentials);
-    DECLARE_EMPTY_VIRTUAL_DESTRUCTOR_WILL_BE_REMOVED(NavigatorCredentials);
+// TODO(Oilpan): when ~DOMWindowProperty is removed, derive from GarbageCollected<> instead.
+class NavigatorCredentials final : public GarbageCollectedFinalized<NavigatorCredentials>, public HeapSupplement<Navigator>, DOMWindowProperty {
+    USING_GARBAGE_COLLECTED_MIXIN(NavigatorCredentials);
 public:
     static NavigatorCredentials& from(Navigator&);
-    static const char* supplementName();
+    virtual ~NavigatorCredentials();
 
     // NavigatorCredentials.idl
     static CredentialsContainer* credentials(Navigator&);
@@ -31,7 +31,9 @@ private:
     explicit NavigatorCredentials(Navigator&);
     CredentialsContainer* credentials();
 
-    PersistentWillBeMember<CredentialsContainer> m_credentialsContainer;
+    static const char* supplementName();
+
+    Member<CredentialsContainer> m_credentialsContainer;
 };
 
 } // namespace blink