[Mac/GN] Do not specify any default_libs to link.

ui/base/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/buildflag_header.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//ui/base/ui_features.gni")
@@ skipping 497 matching lines @@
     sources -= [
       "cursor/image_cursors.cc",
       "cursor/image_cursors.h",
       "dragdrop/drag_utils.cc",
       "dragdrop/drag_utils.h",
     ]
 
     libs += [
       "Accelerate.framework",
       "AudioUnit.framework",
+      "Carbon.framework",
       "CoreVideo.framework",
     ]
   }
 
   if (use_x11 || ozone_platform_x11) {
     #'all_dependent_settings': {
     #'ldflags': [
     #'-L<(PRODUCT_DIR)',
     #],
     #},
@@ skipping 426 matching lines @@
 if (is_mac) {
   mac_framework_bundle("ui_unittests_framework") {
     testonly = true
     deps = [
       "//ui/resources:ui_test_pak_bundle_data",
     ]
     info_plist = "test/framework-Info.plist"
     output_name = "ui_unittests Framework"
   }
 }