Add "UninstallReason" parameter to ExtensionRegistryObserver::OnExtensionUninstalled.

chrome/browser/background/background_contents_service.cc

Index: chrome/browser/background/background_contents_service.cc
diff --git a/chrome/browser/background/background_contents_service.cc b/chrome/browser/background/background_contents_service.cc
index 687d87a3103434423a56b6021e37d3c9bd2bd2c5..540c242afe5c86ed4f287cbac58917941fda9a43 100644
--- a/chrome/browser/background/background_contents_service.cc
+++ b/chrome/browser/background/background_contents_service.cc
@@ -501,7 +501,8 @@ void BackgroundContentsService::Observe(
     case chrome::NOTIFICATION_EXTENSION_UNINSTALLED_DEPRECATED: {
       // Close the crash notification balloon for the app/extension, if any.
       ScheduleCloseBalloon(
-          content::Details<const Extension>(details).ptr()->id());
+          content::Details<extensions::UninstalledExtensionInfo>(details)
+              ->extension->id());
       break;
     }