[Refactor] Move creating a browser if necessary to ExtensionInstallDialogView

chrome/browser/extensions/external_install_error.cc

Index: chrome/browser/extensions/external_install_error.cc
diff --git a/chrome/browser/extensions/external_install_error.cc b/chrome/browser/extensions/external_install_error.cc
index 4b847b1440c30cebbd6ea4bf4082406b3030d09d..3f686ebec323915d677044bd7be7b89d23346243 100644
--- a/chrome/browser/extensions/external_install_error.cc
+++ b/chrome/browser/extensions/external_install_error.cc
@@ -366,8 +366,7 @@ void ExternalInstallError::OnFetchComplete() {
   // to pass ones which may be invalidated.
   install_ui_.reset(
       new ExtensionInstallPrompt(Profile::FromBrowserContext(browser_context_),
-                                 NULL,    // NULL native window.
-                                 NULL));  // NULL navigator.
+                                 NULL));  // NULL native window.
 
   install_ui_->ConfirmExternalInstall(
       this,