Service Worker: set active worker to REDUNDANT when unregistered

content/browser/service_worker/service_worker_version.h

Index: content/browser/service_worker/service_worker_version.h
diff --git a/content/browser/service_worker/service_worker_version.h b/content/browser/service_worker/service_worker_version.h
index 43297ee1fb80913e57469ad5a5c451934d21c1ee..cc9edcba6c9d1ae12f771b3e26c9642499ff0371 100644
--- a/content/browser/service_worker/service_worker_version.h
+++ b/content/browser/service_worker/service_worker_version.h
@@ -63,7 +63,7 @@ class CONTENT_EXPORT ServiceWorkerVersion
     INSTALLING,  // Install event is dispatched and being handled.
     INSTALLED,   // Install event is finished and is ready to be activated.
     ACTIVATING,  // Activate event is dispatched and being handled.
-    ACTIVATED,      // Activation is finished and can run as activated.
+    ACTIVATED,   // Activation is finished and can run as activated.
     REDUNDANT,   // The version is no longer running as activated, due to
                  // unregistration or replace.
   };
@@ -84,6 +84,8 @@ class CONTENT_EXPORT ServiceWorkerVersion
                                         const base::string16& message,
                                         int line_number,
                                         const GURL& source_url) {};
+    // Fired when a version that was the controller of a page no longer controls
+    // any pages.
     virtual void OnNoControllees(ServiceWorkerVersion* version) {};
   };
 
@@ -124,7 +126,7 @@ class CONTENT_EXPORT ServiceWorkerVersion
       bool pause_after_download,
       const StatusCallback& callback);
 
-  // Stops an embedded worker for this version.
+  // Stops the embedded worker for this version.
   // This returns OK (success) if the worker is already stopped.
   void StopWorker(const StatusCallback& callback);
 
@@ -208,7 +210,7 @@ class CONTENT_EXPORT ServiceWorkerVersion
   void AddPotentialControllee(ServiceWorkerProviderHost* provider_host);
   void RemovePotentialControllee(ServiceWorkerProviderHost* provider_host);
 
-  // Returns if it has controllee.
+  // Returns true if it has a controllee, excluding potential ones.
   bool HasControllee() const { return !controllee_map_.empty(); }
 
   // Adds and removes Listeners.