Load the http auth dialog from the main bundle....

chrome/chrome.gyp

 # Copyright (c) 2009 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.
 
 {
   'variables': {
     'chromium_code': 1,
 
     # Define the common dependencies that contain all the actual
     # Chromium functionality.  This list gets pulled in below by
@@ skipping 2321 matching lines @@
                 'xib_files_to_scan': [
                   # The xibs that need localization
                   'app/nibs/About.xib',
                   'app/nibs/BookmarkBar.xib',
                   'app/nibs/BookmarkBubble.xib',
                   'app/nibs/BookmarkEditor.xib',
                   'app/nibs/BookmarkNameFolder.xib',
                   'app/nibs/ClearBrowsingData.xib',
                   'app/nibs/EditSearchEngine.xib',
                   'app/nibs/FirstRunDialog.xib',
+                  'app/nibs/HttpAuthLoginSheet.xib',
                   'app/nibs/HungRendererDialog.xib',
                   'app/nibs/ImportProgressDialog.xib',
                   'app/nibs/KeywordEditor.xib',
                   'app/nibs/MainMenu.xib',
                   'app/nibs/SaveAccessoryView.xib',
                   'app/nibs/TabView.xib',
                   'app/nibs/Toolbar.xib',
                 ],
               },
               'action_name': 'Process xibs for localization',
@@ skipping 3741 matching lines @@
               # Use outputs of this action as inputs for the main target build.
               # Seems as a misnomer but makes this happy on Linux (scons).
               'process_outputs_as_sources': 1,
             },
           ],  # 'actions'
         },
       ]
     }],
   ],  # 'conditions'
 }