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

chrome/browser/ui/views/extensions/extension_install_dialog_view.h

Index: chrome/browser/ui/views/extensions/extension_install_dialog_view.h
diff --git a/chrome/browser/ui/views/extensions/extension_install_dialog_view.h b/chrome/browser/ui/views/extensions/extension_install_dialog_view.h
index d0ee5a2edaf4b6318e3d5f4f489d8e97f06c4df3..b24883021cd368242e67d427dda963c28fc99cdf 100644
--- a/chrome/browser/ui/views/extensions/extension_install_dialog_view.h
+++ b/chrome/browser/ui/views/extensions/extension_install_dialog_view.h
@@ -39,10 +39,11 @@ class Link;
 class ExtensionInstallDialogView : public views::DialogDelegateView,
                                    public views::LinkListener {
  public:
-  ExtensionInstallDialogView(Profile* profile,
-                             content::PageNavigator* navigator,
-                             ExtensionInstallPrompt::Delegate* delegate,
-                             scoped_ptr<ExtensionInstallPrompt::Prompt> prompt);
+  ExtensionInstallDialogView(
+      Profile* profile,
+      content::PageNavigator* navigator,
+      const ExtensionInstallPrompt::DoneCallback& done_callback,
+      scoped_ptr<ExtensionInstallPrompt::Prompt> prompt);
   ~ExtensionInstallDialogView() override;
 
   // Returns the interior ScrollView of the dialog. This allows us to inspect
@@ -91,7 +92,7 @@ class ExtensionInstallDialogView : public views::DialogDelegateView,
 
   Profile* profile_;
   content::PageNavigator* navigator_;
-  ExtensionInstallPrompt::Delegate* delegate_;
+  ExtensionInstallPrompt::DoneCallback done_callback_;
   scoped_ptr<ExtensionInstallPrompt::Prompt> prompt_;
 
   // The container view that contains all children (heading, icon, webstore
@@ -109,8 +110,8 @@ class ExtensionInstallDialogView : public views::DialogDelegateView,
   // ExperienceSampling: Track this UI event.
   scoped_ptr<extensions::ExperienceSamplingEvent> sampling_event_;
 
-  // Set to true once the user's selection has been received and the
-  // |delegate_| has been notified.
+  // Set to true once the user's selection has been received and the callback
+  // has been run.
   bool handled_result_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionInstallDialogView);