service worker: Add CHECKs for investigating null http info bug.

content/browser/service_worker/service_worker_version_unittest.cc

Index: content/browser/service_worker/service_worker_version_unittest.cc
diff --git a/content/browser/service_worker/service_worker_version_unittest.cc b/content/browser/service_worker/service_worker_version_unittest.cc
index 32f7b5c63abf7928ecfe1a3192c75e8d6a8616f4..a81b8cf76f0ed45ca7c05d06487c698b04109a62 100644
--- a/content/browser/service_worker/service_worker_version_unittest.cc
+++ b/content/browser/service_worker/service_worker_version_unittest.cc
@@ -229,6 +229,8 @@ class ServiceWorkerVersionTest : public testing::Test {
     records.push_back(
         ServiceWorkerDatabase::ResourceRecord(10, version_->script_url(), 100));
     version_->script_cache_map()->SetResources(records);
+    version_->SetMainScriptHttpResponseInfo(
+        EmbeddedWorkerTestHelper::CreateHttpResponseInfo());
     version_->set_fetch_handler_existence(
         ServiceWorkerVersion::FetchHandlerExistence::EXISTS);