Service Worker: Migrate to version_uuid and surface ServiceWorker.id. (Blink 1/3)

Source/web/WebSharedWorkerImpl.cpp

Index: Source/web/WebSharedWorkerImpl.cpp
diff --git a/Source/web/WebSharedWorkerImpl.cpp b/Source/web/WebSharedWorkerImpl.cpp
index 4481e1766bc38fa667a305f91cd7ceae84576926..d564be9f521a85c95dc990644688cb07df11a414 100644
--- a/Source/web/WebSharedWorkerImpl.cpp
+++ b/Source/web/WebSharedWorkerImpl.cpp
@@ -207,10 +207,10 @@ bool WebSharedWorkerImpl::isControlledByServiceWorker(WebDataSource& dataSource)
     return m_networkProvider && m_networkProvider->isControlledByServiceWorker(dataSource);
 }
 
-int64_t WebSharedWorkerImpl::serviceWorkerID(WebDataSource& dataSource)
+std::string WebSharedWorkerImpl::serviceWorkerID(WebDataSource& dataSource)
 {
     if (!m_networkProvider)
-        return -1;
+        return std::string();
     return m_networkProvider->serviceWorkerID(dataSource);
 }