[fsp] Add notifications in case of slow operations.

chrome/browser/chromeos/file_system_provider/service.h

Index: chrome/browser/chromeos/file_system_provider/service.h
diff --git a/chrome/browser/chromeos/file_system_provider/service.h b/chrome/browser/chromeos/file_system_provider/service.h
index 460a93ac83541a3c09000365467c4a220008ca36..a48fd2d7a1c1d086e0a661a53ae596e499088592 100644
--- a/chrome/browser/chromeos/file_system_provider/service.h
+++ b/chrome/browser/chromeos/file_system_provider/service.h
@@ -26,7 +26,6 @@
 #include "extensions/common/extension.h"
 
 namespace extensions {
-class EventRouter;
 class ExtensionRegistry;
 }  // namespace extensions
 
@@ -55,7 +54,7 @@ class Service : public KeyedService,
                 public extensions::ExtensionRegistryObserver {
  public:
   typedef base::Callback<ProvidedFileSystemInterface*(
-      extensions::EventRouter* event_router,
+      Profile* profile,
       const ProvidedFileSystemInfo& file_system_info)>
       FileSystemFactoryCallback;