ServiceWorker: Move worker candidate process knowledge to ServiceWorkerProcessManager.

content/browser/service_worker/service_worker_context_core.cc

Index: content/browser/service_worker/service_worker_context_core.cc
diff --git a/content/browser/service_worker/service_worker_context_core.cc b/content/browser/service_worker/service_worker_context_core.cc
index 1943ee890a619f5cfa219a71659c37460dca0ac1..17b181d9ff873885415e334bf462f1477d9a0d43 100644
--- a/content/browser/service_worker/service_worker_context_core.cc
+++ b/content/browser/service_worker/service_worker_context_core.cc
@@ -384,7 +384,9 @@ void ServiceWorkerContextCore::OnReportConsoleMessage(
 }
 
 ServiceWorkerProcessManager* ServiceWorkerContextCore::process_manager() {
-  return wrapper_->process_manager();
+  if (wrapper_)
+    return wrapper_->process_manager();
+  return NULL;
 }
 
 }  // namespace content