Add an extension bubble explaining which extensions are in dev mode.

chrome/chrome_browser_ui.gypi

 # Copyright 2012 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.
 
 {
   'targets': [
     {
       'target_name': 'browser_ui',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 1788 matching lines @@
         'browser/ui/views/extensions/bundle_installed_bubble.cc',
         'browser/ui/views/extensions/extension_dialog.cc',
         'browser/ui/views/extensions/extension_dialog.h',
         'browser/ui/views/extensions/extension_dialog_observer.cc',
         'browser/ui/views/extensions/extension_dialog_observer.h',
         'browser/ui/views/extensions/extension_install_dialog_view.cc',
         'browser/ui/views/extensions/extension_installed_bubble_view.cc',
         'browser/ui/views/extensions/extension_installed_bubble_view.h',
         'browser/ui/views/extensions/extension_keybinding_registry_views.cc',
         'browser/ui/views/extensions/extension_keybinding_registry_views.h',
+        'browser/ui/views/extensions/extension_message_bubble_view.cc',
+        'browser/ui/views/extensions/extension_message_bubble_view.h',
         'browser/ui/views/extensions/extension_popup.cc',
         'browser/ui/views/extensions/extension_popup.h',
         'browser/ui/views/extensions/extension_uninstall_dialog_view.cc',
         'browser/ui/views/extensions/extension_view_views.cc',
         'browser/ui/views/extensions/extension_view_views.h',
         'browser/ui/views/extensions/media_galleries_dialog_views.cc',
         'browser/ui/views/extensions/media_galleries_dialog_views.h',
         'browser/ui/views/external_protocol_dialog.cc',
         'browser/ui/views/external_protocol_dialog.h',
-        'browser/ui/views/extensions/suspicious_extension_bubble_view.h',
-        'browser/ui/views/extensions/suspicious_extension_bubble_view.cc',
         'browser/ui/views/external_tab_container_win.cc',
         'browser/ui/views/external_tab_container_win.h',
         'browser/ui/views/find_bar_host.cc',
         'browser/ui/views/find_bar_host.h',
         'browser/ui/views/find_bar_host_aura.cc',
         'browser/ui/views/find_bar_host_win.cc',
         'browser/ui/views/find_bar_view.cc',
         'browser/ui/views/find_bar_view.h',
         'browser/ui/views/first_run_bubble.cc',
         'browser/ui/views/first_run_bubble.h',
@@ skipping 1541 matching lines @@
             'browser/ui/webui/local_discovery/local_discovery_ui.cc',
             'browser/ui/webui/local_discovery/local_discovery_ui.h',
             'browser/ui/webui/local_discovery/local_discovery_ui_handler.cc',
             'browser/ui/webui/local_discovery/local_discovery_ui_handler.h',
           ],
         }],
       ],
     },
   ],
 }