Created min size for print preview dialog and modified to allow the

chrome/browser/chromeos/login/ui/captive_portal_window_proxy.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 "chrome/browser/chromeos/login/ui/captive_portal_window_proxy.h"
 
 #include "base/metrics/histogram_macros.h"
 #include "chrome/browser/chromeos/login/ui/captive_portal_view.h"
 #include "chrome/browser/chromeos/login/ui/proxy_settings_dialog.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
@@ skipping 63 matching lines @@
   InitCaptivePortalView();
 
   CaptivePortalView* portal = captive_portal_view_.release();
   auto* manager =
       web_modal::WebContentsModalDialogManager::FromWebContents(web_contents_);
   widget_ = CreateWindowAsFramelessChild(
       portal,
       manager->delegate()->GetWebContentsModalDialogHost()->GetHostView());
   portal->Init();
   widget_->AddObserver(this);
-  manager->ShowModalDialog(widget_->GetNativeView());
+  manager->ShowModalDialog(widget_->GetNativeView(), NULL, NULL);
 }
 
 void CaptivePortalWindowProxy::Close() {
   if (GetState() == STATE_DISPLAYED)
     widget_->Close();
   captive_portal_view_.reset();
   captive_portal_view_for_testing_ = NULL;
 }
 
 void CaptivePortalWindowProxy::OnRedirected() {
@@ skipping 58 matching lines @@
 }
 
 void CaptivePortalWindowProxy::DetachFromWidget(views::Widget* widget) {
   if (!widget_ || widget_ != widget)
     return;
   widget_->RemoveObserver(this);
   widget_ = NULL;
 }
 
 }  // namespace chromeos