MacViews: All targets compile. Fixes unit_tests and message_center_unittests

ui/message_center/BUILD.gn

 # 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 
 component("message_center") {
   defines = [ "MESSAGE_CENTER_IMPLEMENTATION" ]
 
@@ skipping 58 matching lines @@
       "notifier_settings.cc",
       "notifier_settings.h",
     ]
 
     if (is_win) {
       # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
       cflags = [ "/wd4267" ]
       deps += [ "//ui/aura" ]
     }
 
-    if (toolkit_views) {
+    # On Mac, toolkit-views builds still use the Cocoa UI. Keep this in sync
+    # with message_center_unittests below.
+    if (toolkit_views && !is_mac) {
       sources += [
         "views/bounded_label.cc",
         "views/bounded_label.h",
         "views/constants.h",
         "views/desktop_popup_alignment_delegate.cc",
         "views/desktop_popup_alignment_delegate.h",
         "views/message_center_controller.h",
         "views/message_center_button_bar.cc",
         "views/message_center_button_bar.h",
         "views/message_center_view.cc",
@@ skipping 111 matching lines @@
       "message_center_tray_unittest.cc",
       "message_center_impl_unittest.cc",
       "notification_delegate_unittest.cc",
       "notification_list_unittest.cc",
     ]
 
     if (is_mac) {
       deps += [ "//ui/gfx:test_support" ]
     }
 
-    if (toolkit_views) {
+    if (toolkit_views && !is_mac) {
       sources += [
         "views/bounded_label_unittest.cc",
         "views/message_center_view_unittest.cc",
         "views/message_popup_collection_unittest.cc",
         "views/notification_view_unittest.cc",
         "views/notifier_settings_view_unittest.cc",
       ]
       deps += [
         # Compositor is needed by message_center_view_unittest.cc and for the
         # fonts used by bounded_label_unittest.cc.
         "//ui/compositor",
         "//ui/views",
         "//ui/views:test_support",
       ]
     }
   }  # enable_notifications
 }