Add a blob field to ServiceWorkerFetchResponse and read the blob

content/renderer/service_worker/embedded_worker_context_client.cc

Index: content/renderer/service_worker/embedded_worker_context_client.cc
diff --git a/content/renderer/service_worker/embedded_worker_context_client.cc b/content/renderer/service_worker/embedded_worker_context_client.cc
index 3ff7d0f796f06978a0a8a8ebb23258433a64fad9..ac8fd3d264bfb445c8b7cf9cdd4e03f6c3949832 100644
--- a/content/renderer/service_worker/embedded_worker_context_client.cc
+++ b/content/renderer/service_worker/embedded_worker_context_client.cc
@@ -243,7 +243,8 @@ void EmbeddedWorkerContextClient::didHandleFetchEvent(
   ServiceWorkerResponse response(web_response.statusCode(),
                                  web_response.statusText().utf8(),
                                  web_response.method().utf8(),
-                                 std::map<std::string, std::string>());
+                                 std::map<std::string, std::string>(),
+                                 std::string());
   script_context_->DidHandleFetchEvent(
       request_id, SERVICE_WORKER_FETCH_EVENT_RESULT_RESPONSE, response);
 }