Add blink-side plumbing for ServiceWorker -> Document postMessage (1/3)

Source/modules/serviceworkers/NavigatorServiceWorker.h

Index: Source/modules/serviceworkers/NavigatorServiceWorker.h
diff --git a/Source/modules/serviceworkers/NavigatorServiceWorker.h b/Source/modules/serviceworkers/NavigatorServiceWorker.h
index e1815657dd674b5c23cdb7db50abd0ef88a8a5da..8be661bb81a790abcec09f98ecf2d7338ffeef95 100644
--- a/Source/modules/serviceworkers/NavigatorServiceWorker.h
+++ b/Source/modules/serviceworkers/NavigatorServiceWorker.h
@@ -5,13 +5,13 @@
 #ifndef NavigatorServiceWorker_h
 #define NavigatorServiceWorker_h
 
-#include "bindings/v8/ScriptPromise.h"
 #include "core/frame/Navigator.h"
 #include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
 
 namespace WebCore {
 
+class Document;
 class Navigator;
 class ServiceWorkerContainer;
 
@@ -19,6 +19,7 @@ class NavigatorServiceWorker FINAL : public NoBaseWillBeGarbageCollectedFinalize
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(NavigatorServiceWorker);
 public:
     virtual ~NavigatorServiceWorker();
+    static NavigatorServiceWorker* from(Document&);
     static NavigatorServiceWorker& from(Navigator&);
     static NavigatorServiceWorker* toNavigatorServiceWorker(Navigator&);
     static const char* supplementName();