[Extensions] Migrate ExtensionInstallPrompt::Delegate to be a callback

chrome/browser/extensions/extension_reenabler_unittest.cc

Index: chrome/browser/extensions/extension_reenabler_unittest.cc
diff --git a/chrome/browser/extensions/extension_reenabler_unittest.cc b/chrome/browser/extensions/extension_reenabler_unittest.cc
index e6328c2be66a79a0aa8ccf04a85ef0811f92dc1c..f0a0f12948bd4609955d6c585e7480634b75c99f 100644
--- a/chrome/browser/extensions/extension_reenabler_unittest.cc
+++ b/chrome/browser/extensions/extension_reenabler_unittest.cc
@@ -80,7 +80,7 @@ class CallbackHelper {
 
   // The callback to run when a test ExtensionInstallPrompt is ready to show.
   void OnShow(ExtensionInstallPromptShowParams* show_params,
-              ExtensionInstallPrompt::Delegate* delegate,
+              const ExtensionInstallPrompt::DoneCallback& done_callback,
               scoped_ptr<ExtensionInstallPrompt::Prompt> prompt) {
     DCHECK(!quit_closure_.is_null());
     quit_closure_.Run();