Simplify WebServiceWorker{Registration}Proxy interfaces.

public/platform/WebServiceWorkerRegistrationProxy.h

Index: public/platform/WebServiceWorkerRegistrationProxy.h
diff --git a/public/platform/WebServiceWorkerRegistrationProxy.h b/public/platform/WebServiceWorkerRegistrationProxy.h
index b6d6d37cbffe0180427b20963c926b837bfdc353..e6a7a81627e6a00c19669bd7f68c6159482a5724 100644
--- a/public/platform/WebServiceWorkerRegistrationProxy.h
+++ b/public/platform/WebServiceWorkerRegistrationProxy.h
@@ -5,14 +5,8 @@
 #ifndef WebServiceWorkerRegistrationProxy_h
 #define WebServiceWorkerRegistrationProxy_h
 
-#if INSIDE_BLINK
-#include "platform/heap/Handle.h"
-#endif
-#include "public/platform/WebCommon.h"
-
 namespace blink {
 
-class ServiceWorkerRegistration;
 class WebServiceWorker;
 
 // A proxy interface, passed via WebServiceWorkerRegistration.setProxy() from
@@ -20,9 +14,6 @@ class WebServiceWorker;
 // embedder.
 class WebServiceWorkerRegistrationProxy {
 public:
-    WebServiceWorkerRegistrationProxy() : m_private(0) { }
-    virtual ~WebServiceWorkerRegistrationProxy() { }
-
     // Notifies that the registration entered the installation process.
     // The installing worker should be accessible via
     // WebServiceWorkerRegistration.installing.
@@ -32,18 +23,8 @@ public:
     virtual void setWaiting(WebServiceWorker*) = 0;
     virtual void setActive(WebServiceWorker*) = 0;
 
-#if INSIDE_BLINK
-    BLINK_PLATFORM_EXPORT WebServiceWorkerRegistrationProxy(ServiceWorkerRegistration*);
-    BLINK_PLATFORM_EXPORT operator ServiceWorkerRegistration*() const;
-#endif
-
 protected:
-#if INSIDE_BLINK
-    // This is a back pointer to |this| object.
-    // The ServiceWorkerRegistration inherits from this WebServiceWorkerRegistrationProxy.
-    GC_PLUGIN_IGNORE("crbug.com/410257")
-#endif
-    ServiceWorkerRegistration* m_private;
+    virtual ~WebServiceWorkerRegistrationProxy() { }
 };
 
 } // namespace blink