Add invalidation to url_response_disk_cache.

shell/application_manager/network_fetcher.h

Index: shell/application_manager/network_fetcher.h
diff --git a/shell/application_manager/network_fetcher.h b/shell/application_manager/network_fetcher.h
index 2ef483be2ca1cdd2c366e5bafe0462fe5a08ef2a..6161dd801542c319bf3d44676a2eebf1a26bcc70 100644
--- a/shell/application_manager/network_fetcher.h
+++ b/shell/application_manager/network_fetcher.h
@@ -49,20 +49,27 @@ class NetworkFetcher : public Fetcher {
   // are not loaded from cache to allow effective development.
   bool CanLoadDirectlyFromCache();
 
-  void LoadFromCache(bool schedule_update);
+  // Tries to load the URL directly from the offline cache.
+  void LoadFromCache();
 
-  void OnCachedResponseReceived(bool schedule_update,
-                                mojo::URLResponsePtr response,
-                                mojo::Array<uint8_t> path_as_array,
-                                mojo::Array<uint8_t> cache_dir);
+  // Callback from the offline cache.
+  void OnResponseReceived(bool schedule_update,
+                          mojo::URLResponsePtr response,
+                          mojo::Array<uint8_t> path_as_array,
+                          mojo::Array<uint8_t> cache_dir);
 
+  // Start a network request to load the URL.
   void StartNetworkRequest();
 
+  // Callback from the network stack.
   void OnLoadComplete(mojo::URLResponsePtr response);
 
-  void OnFileSavedToCache(mojo::Array<uint8_t> path_as_array,
+  // Callback from the offline cache when the response is saved by the cache.
+  void OnFileSavedToCache(mojo::URLResponsePtr response,
+                          mojo::Array<uint8_t> path_as_array,
                           mojo::Array<uint8_t> cache_dir);
 
+  // Record the mapping from URLs to files.
   static void RecordCacheToURLMapping(const base::FilePath& path,
                                       const GURL& url);