[Background Sync] Remove single-parameter sync dispatch methods

public/web/WebServiceWorkerContextProxy.h

Index: public/web/WebServiceWorkerContextProxy.h
diff --git a/public/web/WebServiceWorkerContextProxy.h b/public/web/WebServiceWorkerContextProxy.h
index 8d8d37207de8d60f618836a8cd17e1ae7ca0d7ba..ee16343ea8c536946964e5440bc0c1ed8fe4f3f3 100644
--- a/public/web/WebServiceWorkerContextProxy.h
+++ b/public/web/WebServiceWorkerContextProxy.h
@@ -74,9 +74,6 @@ public:
 
     // Once the ServiceWorker has finished handling the sync event,
     // didHandleSyncEvent is called on the context client.
-    // TODO(iclelland): Remove the single-parameter version once all call sites
-    // have been updated.
-    virtual void dispatchSyncEvent(int syncEventID) = 0;
     virtual void dispatchSyncEvent(int syncEventID, const WebSyncRegistration&) = 0;
 
     virtual void addStashedMessagePorts(const WebMessagePortChannelArray& channels, const WebVector<WebString>& channelNames) {}