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

Source/modules/plugins/NavigatorPlugins.h

Index: Source/modules/plugins/NavigatorPlugins.h
diff --git a/Source/modules/plugins/NavigatorPlugins.h b/Source/modules/plugins/NavigatorPlugins.h
index c2a99f78d1cf7c187ea25d5184ead3544cb43725..6f0de460216700dc62461d8f0e1bcc7fe66be7bb 100644
--- a/Source/modules/plugins/NavigatorPlugins.h
+++ b/Source/modules/plugins/NavigatorPlugins.h
@@ -15,16 +15,14 @@ class DOMPluginArray;
 class LocalFrame;
 class Navigator;
 
-class NavigatorPlugins final
-    : public NoBaseWillBeGarbageCollected<NavigatorPlugins>
-    , public WillBeHeapSupplement<Navigator>
-    , DOMWindowProperty {
-    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(NavigatorPlugins);
-    DECLARE_EMPTY_VIRTUAL_DESTRUCTOR_WILL_BE_REMOVED(NavigatorPlugins);
+// TODO(Oilpan): when ~DOMWindowProperty is removed, derive from GarbageCollected<> instead.
+class NavigatorPlugins final : public GarbageCollectedFinalized<NavigatorPlugins>, public HeapSupplement<Navigator>, DOMWindowProperty {
+    USING_GARBAGE_COLLECTED_MIXIN(NavigatorPlugins);
 public:
     static NavigatorPlugins& from(Navigator&);
     static NavigatorPlugins* toNavigatorPlugins(Navigator&);
-    static const char* supplementName();
+
+    virtual ~NavigatorPlugins();
 
     static DOMPluginArray* plugins(Navigator&);
     static DOMMimeTypeArray* mimeTypes(Navigator&);
@@ -35,6 +33,8 @@ public:
 private:
     explicit NavigatorPlugins(Navigator&);
 
+    static const char* supplementName();
+
     DOMPluginArray* plugins(LocalFrame*) const;
     DOMMimeTypeArray* mimeTypes(LocalFrame*) const;
     bool javaEnabled(LocalFrame*) const;