Print Preview: Fix failure to save with long page title

ui/shell_dialogs/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/ui.gni")
 import("//testing/test.gni")
 if (is_android) {
   import("//build/config/android/config.gni")
 }
 
@@ skipping 59 matching lines @@
       "AppKit.framework",
     ]
   }
 }
 
 test("shell_dialogs_unittests") {
   sources = [
     # TODO(karandeepb) : Revisit this once gn gets mac bundle support.
     # "select_file_dialog_mac_unittest.mm",
     "run_all_unittests.cc",
+    "select_file_dialog_unittest.cc",
     "select_file_dialog_win_unittest.cc",
   ]
 
   deps = [
     ":shell_dialogs",
     "//base",
     "//base/test:test_support",
     "//testing/gtest",
     "//ui/base:base",
   ]
 }