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

Source/core/fetch/ResourceFetcher.cpp

Index: Source/core/fetch/ResourceFetcher.cpp
diff --git a/Source/core/fetch/ResourceFetcher.cpp b/Source/core/fetch/ResourceFetcher.cpp
index af4d726b500337d7789b38d13b016ba462ba6dc7..91546f92cee998f73c676497af4808b359ebb04f 100644
--- a/Source/core/fetch/ResourceFetcher.cpp
+++ b/Source/core/fetch/ResourceFetcher.cpp
@@ -1020,7 +1020,7 @@ const ResourceLoaderOptions& ResourceFetcher::defaultResourceOptions()
 String ResourceFetcher::getCacheIdentifier() const
 {
     if (context().isControlledByServiceWorker())
-        return String::number(context().serviceWorkerID());
+        return String::fromUTF8(context().serviceWorkerID().c_str());
     return MemoryCache::defaultCacheIdentifier();
 }