Streamlined sideload UI for extensions from the webstore.

chrome/browser/extensions/extension_install_prompt.h

Index: chrome/browser/extensions/extension_install_prompt.h
diff --git a/chrome/browser/extensions/extension_install_prompt.h b/chrome/browser/extensions/extension_install_prompt.h
index bc109c7e063f7e06a8e7223cf20598b814fd7cf3..79d01f956b32e152d5b30d62f70c2e559d4ca52d 100644
--- a/chrome/browser/extensions/extension_install_prompt.h
+++ b/chrome/browser/extensions/extension_install_prompt.h
@@ -268,8 +268,10 @@ class ExtensionInstallPrompt
   // extension should be enabled (external extensions are installed disabled).
   //
   // We *MUST* eventually call either Proceed() or Abort() on |delegate|.
-  virtual void ConfirmExternalInstall(Delegate* delegate,
-                                      const extensions::Extension* extension);
+  virtual void ConfirmExternalInstall(
+      Delegate* delegate,
+      const extensions::Extension* extension,
+      const ShowDialogCallback& show_dialog_callback);
 
   // This is called by the extension permissions API to verify whether an
   // extension may be granted additional permissions.