Remove need to sign in to use the App Launcher.

ui/app_list/app_list.gyp

Index: ui/app_list/app_list.gyp
diff --git a/ui/app_list/app_list.gyp b/ui/app_list/app_list.gyp
index a2c56604abddee279af4a448cac7826fcd3f7c55..3b4ee3e075f9a3d8f1b38ebba10046b96820c291 100644
--- a/ui/app_list/app_list.gyp
+++ b/ui/app_list/app_list.gyp
@@ -70,8 +70,6 @@
         'cocoa/item_drag_controller.mm',
         'cocoa/scroll_view_with_no_scrollbars.h',
         'cocoa/scroll_view_with_no_scrollbars.mm',
-        'cocoa/signin_view_controller.h',
-        'cocoa/signin_view_controller.mm',
         'pagination_model.cc',
         'pagination_model.h',
         'pagination_model_observer.h',
@@ -80,8 +78,6 @@
         'search_box_model_observer.h',
         'search_result.cc',
         'search_result.h',
-        'signin_delegate.cc',
-        'signin_delegate.h',
         'speech_ui_model.cc',
         'speech_ui_model.h',
         'speech_ui_model_observer.h',
@@ -132,8 +128,6 @@
         'views/search_result_list_view_delegate.h',
         'views/search_result_view.cc',
         'views/search_result_view.h',
-        'views/signin_view.cc',
-        'views/signin_view.h',
         'views/speech_view.cc',
         'views/speech_view.h',
         'views/start_page_view.cc',
@@ -221,7 +215,6 @@
         'cocoa/apps_grid_controller_unittest.mm',
         'cocoa/apps_search_box_controller_unittest.mm',
         'cocoa/apps_search_results_controller_unittest.mm',
-        'cocoa/signin_view_controller_unittest.mm',
         'cocoa/test/apps_grid_controller_test_helper.h',
         'cocoa/test/apps_grid_controller_test_helper.mm',
         'test/run_all_unittests.cc',