Add flag to show toolkit-views dialogs on Mac, start with HTTP-Auth.

chrome/browser/ui/views/browser_dialogs_views.cc

+// Copyright 2015 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/ui/browser_dialogs.h"
+
+#include "chrome/browser/ui/login/login_prompt.h"
+
+// This file provides definitions of desktop browser dialog-creation methods for
+// all toolkit-views platforms other than Mac. It also provides the definitions
+// on Mac when mac_views_browser=1 is specified in GYP_DEFINES. The file is
+// excluded in a Mac Cocoa build: definitions under chrome/browser/ui/cocoa may
+// select at runtime whether to show a Cocoa dialog, or the toolkit-views dialog
+// provided by browser_dialogs.h.
+
+// static
+LoginHandler* LoginHandler::Create(net::AuthChallengeInfo* auth_info,
+                                   net::URLRequest* request) {
+  return chrome::CreateLoginHandlerViews(auth_info, request);
+}