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

chrome/browser/extensions/extension_reenabler_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/macros.h"
 #include "base/run_loop.h"
 #include "chrome/browser/extensions/extension_install_prompt.h"
 #include "chrome/browser/extensions/extension_reenabler.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_service_test_base.h"
@@ skipping 62 matching lines @@
   }
 
  private:
   // The callback to run once the reenable process finishes.
   void OnComplete(ExtensionReenabler::ReenableResult result) {
     result_.reset(new ExtensionReenabler::ReenableResult(result));
   }
 
   // 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();
     quit_closure_ = base::Closure();
   }
 
   // The closure to quit the currently-running loop; used with test
   // ExtensionInstallPrompts.
   base::Closure quit_closure_;
 
@@ skipping 167 matching lines @@
     EXPECT_FALSE(callback_helper.has_result());
     // Destroy the reenabler to simulate the owning context being shut down
     // (e.g., the tab closing).
     extension_reenabler.reset();
     EXPECT_TRUE(
         callback_helper.result_matches(ExtensionReenabler::ABORTED));
   }
 }
 
 }  // namespace extensions