Tidy up CompositorWorkerManager unit tests.

Source/modules/serviceworkers/ServiceWorkerContainerClient.cpp

Index: Source/modules/serviceworkers/ServiceWorkerContainerClient.cpp
diff --git a/Source/modules/serviceworkers/ServiceWorkerContainerClient.cpp b/Source/modules/serviceworkers/ServiceWorkerContainerClient.cpp
index 5b917184e0caf8986ab78ef5c9f07df73de66fd0..27481cfdf65ef737a0ca1416e2b7933aad66a055 100644
--- a/Source/modules/serviceworkers/ServiceWorkerContainerClient.cpp
+++ b/Source/modules/serviceworkers/ServiceWorkerContainerClient.cpp
@@ -44,14 +44,9 @@ ServiceWorkerContainerClient* ServiceWorkerContainerClient::from(ExecutionContex
         return static_cast<ServiceWorkerContainerClient*>(WillBeHeapSupplement<Document>::from(document, supplementName()));
     }
 
-    if (context->isServiceWorkerGlobalScope()) {
-        ServiceWorkerContainerClient* client = static_cast<ServiceWorkerContainerClient*>(WillBeHeapSupplement<WorkerClients>::from(toWorkerGlobalScope(context)->clients(), supplementName()));
-        ASSERT(client);
-        return client;
-    }
-
-    ASSERT(context->isWorkerGlobalScope());
-    return static_cast<ServiceWorkerContainerClient*>(WillBeHeapSupplement<WorkerClients>::from(toWorkerGlobalScope(context)->clients(), supplementName()));
+    WorkerClients* clients = toWorkerGlobalScope(context)->clients();
+    ASSERT(clients);
+    return static_cast<ServiceWorkerContainerClient*>(WillBeHeapSupplement<WorkerClients>::from(clients, supplementName()));
 }
 
 ServiceWorkerContainerClient::ServiceWorkerContainerClient(PassOwnPtr<WebServiceWorkerProvider> provider)