Adds a basic offline check to InstallableManager.

content/browser/service_worker/service_worker_context_core.h

Index: content/browser/service_worker/service_worker_context_core.h
diff --git a/content/browser/service_worker/service_worker_context_core.h b/content/browser/service_worker/service_worker_context_core.h
index bb1fc8993cc8fca8c8472648306c06ccd72031bb..c837b46689afe8196daab3c02088d13068dc404a 100644
--- a/content/browser/service_worker/service_worker_context_core.h
+++ b/content/browser/service_worker/service_worker_context_core.h
@@ -283,11 +283,11 @@ class CONTENT_EXPORT ServiceWorkerContextCore
 
   // Determines if there is a ServiceWorker registration that matches |url|, and
   // if |other_url| falls inside the scope of the same registration. See
-  // ServiceWorkerContext::CheckHasServiceWorker for more details.
-  void CheckHasServiceWorker(
+  // ServiceWorkerContext::CheckServiceWorkerStatus for more details.
+  void CheckServiceWorkerStatus(
       const GURL& url,
       const GURL& other_url,
-      const ServiceWorkerContext::CheckHasServiceWorkerCallback callback);
+      const ServiceWorkerContext::CheckServiceWorkerStatusCallback callback);
 
   void UpdateVersionFailureCount(int64_t version_id,
                                  ServiceWorkerStatusCode status);
@@ -337,13 +337,13 @@ class CONTENT_EXPORT ServiceWorkerContextCore
       ServiceWorkerStatusCode status,
       const std::vector<ServiceWorkerRegistrationInfo>& registrations);
 
-  void DidFindRegistrationForCheckHasServiceWorker(
+  void DidFindRegistrationForCheckServiceWorkerStatus(
       const GURL& other_url,
-      const ServiceWorkerContext::CheckHasServiceWorkerCallback callback,
+      const ServiceWorkerContext::CheckServiceWorkerStatusCallback callback,
       ServiceWorkerStatusCode status,
       scoped_refptr<ServiceWorkerRegistration> registration);
-  void OnRegistrationFinishedForCheckHasServiceWorker(
-      const ServiceWorkerContext::CheckHasServiceWorkerCallback callback,
+  void OnRegistrationFinishedForCheckServiceWorkerStatus(
+      const ServiceWorkerContext::CheckServiceWorkerStatusCallback callback,
       scoped_refptr<ServiceWorkerRegistration> registration);
 
   // It's safe to store a raw pointer instead of a scoped_refptr to |wrapper_|