Fix permission regression where warnings aren't shown in the dialog

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 7d423e7489a73be966b578dcffe39597cc8f4a9f..fbf7b909372fa7a8fd8c59b4dfb17e8048e5b3fc 100644
--- a/chrome/browser/extensions/extension_install_prompt.h
+++ b/chrome/browser/extensions/extension_install_prompt.h
@@ -362,6 +362,10 @@ class ExtensionInstallPrompt
   // Installation failed. This is declared virtual for testing.
   virtual void OnInstallFailure(const extensions::CrxInstallerError& error);
 
+  void set_callback_for_test(const ShowDialogCallback& show_dialog_callback) {
+    show_dialog_callback_ = show_dialog_callback;
+  }
+
  protected:
   friend class extensions::ExtensionWebstorePrivateApiTest;
   friend class WebstoreStartupInstallUnpackFailureTest;