blink: Cleanup class forward declarations

third_party/WebKit/Source/modules/background_sync/SyncCallbacks.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SyncCallbacks_h
 #define SyncCallbacks_h
 
 #include "platform/heap/Handle.h"
 #include "public/platform/WebCallbacks.h"
 #include "public/platform/modules/background_sync/WebSyncProvider.h"
 #include "public/platform/modules/background_sync/WebSyncRegistration.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 class ServiceWorkerRegistration;
 class ScriptPromiseResolver;
 struct WebSyncError;
 struct WebSyncRegistration;
-class WebString;
 
 // SyncRegistrationCallbacks is an implementation of
 // WebSyncRegistrationCallbacks that will resolve the underlying promise
 // depending on the result passed to the callback. It takes a
 // ServiceWorkerRegistration in its constructor and will pass it to the
 // SyncRegistration.
 class SyncRegistrationCallbacks final : public WebSyncRegistrationCallbacks {
   WTF_MAKE_NONCOPYABLE(SyncRegistrationCallbacks);
   // FIXME(tasak): When making public/platform classes to use PartitionAlloc,
   // the following macro should be moved to WebCallbacks defined in
@@ skipping 34 matching lines @@
   void onError(const WebSyncError&) override;
 
  private:
   Persistent<ScriptPromiseResolver> m_resolver;
   Persistent<ServiceWorkerRegistration> m_serviceWorkerRegistration;
 };
 
 }  // namespace blink
 
 #endif  // SyncCallbacks_h