Show About in a window too.

chrome/browser/ui/settings_window_manager_browsertest.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/ui/settings_window_manager.h"
 
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 176 matching lines @@
   EXPECT_EQ(1u, chrome::GetTotalBrowserCount());
 
   // History should open in the existing browser window.
   chrome::ShowHistory(browser());
   EXPECT_EQ(1u, chrome::GetTotalBrowserCount());
 
   // Settings should open a new browser window.
   chrome::ShowSettings(browser());
   EXPECT_EQ(2u, chrome::GetTotalBrowserCount());
 
+  // About should reuse the existing Settings window.
+  chrome::ShowAboutChrome(browser());
+  EXPECT_EQ(2u, chrome::GetTotalBrowserCount());
+
   // Extensions should open in an existing browser window.
   CloseNonDefaultBrowsers();
   EXPECT_EQ(1u, chrome::GetTotalBrowserCount());
   std::string extension_to_highlight;  // none
   chrome::ShowExtensions(browser(), extension_to_highlight);
   EXPECT_EQ(1u, chrome::GetTotalBrowserCount());
 
   // Downloads should open in an existing browser window.
   chrome::ShowDownloads(browser());
   EXPECT_EQ(1u, chrome::GetTotalBrowserCount());
+
+  // About should open a new browser window.
+  chrome::ShowAboutChrome(browser());
+  EXPECT_EQ(2u, chrome::GetTotalBrowserCount());
 }