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

Source/core/frame/Navigator.h

Index: Source/core/frame/Navigator.h
diff --git a/Source/core/frame/Navigator.h b/Source/core/frame/Navigator.h
index 4138d60e5022d2a92ecbc939bbbeb8f5743f778f..864b08253670ae1d993a92a730b23fa6ae4df86e 100644
--- a/Source/core/frame/Navigator.h
+++ b/Source/core/frame/Navigator.h
@@ -29,9 +29,6 @@
 #include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Forward.h"
-#include "wtf/PassRefPtr.h"
-#include "wtf/RefCounted.h"
-#include "wtf/RefPtr.h"
 
 namespace blink {
 
@@ -40,20 +37,20 @@ class LocalFrame;
 typedef int ExceptionCode;
 
 class Navigator final
-    : public RefCountedWillBeGarbageCollectedFinalized<Navigator>
+    : public GarbageCollectedFinalized<Navigator>
     , public NavigatorCPU
     , public NavigatorID
     , public NavigatorLanguage
     , public NavigatorOnLine
     , public ScriptWrappable
     , public DOMWindowProperty
-    , public WillBeHeapSupplementable<Navigator> {
+    , public HeapSupplementable<Navigator> {
     DEFINE_WRAPPERTYPEINFO();
-    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(Navigator);
+    USING_GARBAGE_COLLECTED_MIXIN(Navigator);
 public:
-    static PassRefPtrWillBeRawPtr<Navigator> create(LocalFrame* frame)
+    static Navigator* create(LocalFrame* frame)
     {
-        return adoptRefWillBeNoop(new Navigator(frame));
+        return new Navigator(frame);
     }
 
     virtual ~Navigator();