Turn WorkerLoaderProxy into a threadsafe, ref-counted object.

Source/modules/serviceworkers/ServiceWorkerThread.cpp

Index: Source/modules/serviceworkers/ServiceWorkerThread.cpp
diff --git a/Source/modules/serviceworkers/ServiceWorkerThread.cpp b/Source/modules/serviceworkers/ServiceWorkerThread.cpp
index b732b91339184ca77bbfffc98dd6f96ddf2e0cd9..022975d948efd3fd049915ca8ca6373ae9d592ab 100644
--- a/Source/modules/serviceworkers/ServiceWorkerThread.cpp
+++ b/Source/modules/serviceworkers/ServiceWorkerThread.cpp
@@ -37,12 +37,12 @@
 
 namespace blink {
 
-PassRefPtr<ServiceWorkerThread> ServiceWorkerThread::create(WorkerLoaderProxy& workerLoaderProxy, WorkerReportingProxy& workerReportingProxy, PassOwnPtrWillBeRawPtr<WorkerThreadStartupData> startupData)
+PassRefPtr<ServiceWorkerThread> ServiceWorkerThread::create(PassRefPtr<WorkerLoaderProxy> workerLoaderProxy, WorkerReportingProxy& workerReportingProxy, PassOwnPtrWillBeRawPtr<WorkerThreadStartupData> startupData)
 {
     return adoptRef(new ServiceWorkerThread(workerLoaderProxy, workerReportingProxy, startupData));
 }
 
-ServiceWorkerThread::ServiceWorkerThread(WorkerLoaderProxy& workerLoaderProxy, WorkerReportingProxy& workerReportingProxy, PassOwnPtrWillBeRawPtr<WorkerThreadStartupData> startupData)
+ServiceWorkerThread::ServiceWorkerThread(PassRefPtr<WorkerLoaderProxy> workerLoaderProxy, WorkerReportingProxy& workerReportingProxy, PassOwnPtrWillBeRawPtr<WorkerThreadStartupData> startupData)
     : WorkerThread(workerLoaderProxy, workerReportingProxy, startupData)
 {
 }