ui: Have shell_dialogs into its own gyp file under its shell_dialogs/ directory.

chrome/chrome_tests_unit.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': [
     {
       # This target contains mocks and test utilities that don't belong in
       # production libraries but are used by more than one test executable.
       'target_name': 'test_support_common',
       'type': 'static_library',
@@ skipping 461 matching lines @@
         'test_support_unit',
         # 3) anything tests directly depend on
         '../courgette/courgette.gyp:courgette_lib',
         '../google_apis/google_apis.gyp:google_apis',
         '../skia/skia.gyp:skia',
         '../third_party/cacheinvalidation/cacheinvalidation.gyp:cacheinvalidation',
         '../third_party/icu/icu.gyp:icui18n',
         '../third_party/icu/icu.gyp:icuuc',
         '../third_party/libxml/libxml.gyp:libxml',
         '../ui/ui.gyp:ui_resources',
-        '../ui/ui.gyp:ui_test_support',
+        '../ui/ui_unittests.gyp:ui_test_support',
         'chrome_resources.gyp:chrome_resources',
         'chrome_resources.gyp:chrome_strings',
       ],
       # TODO(joi): Remove this section once the google_apis tests are
       # a separate unit test binary.
       'includes': [
         '../google_apis/determine_use_official_keys.gypi',
       ],
       'include_dirs': [
         '..',
@@ skipping 2405 matching lines @@
             'browser/ui/app_list/test/fake_profile.h',
             'browser/ui/app_list/test/fake_profile_store.cc',
             'browser/ui/app_list/test/fake_profile_store.h',
             'browser/ui/app_list/test/fast_show_pickler_unittest.cc',
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }