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

ui/aura/aura.gyp

 # Copyright (c) 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 123 matching lines @@
     },
     {
       'target_name': 'aura_test_support',
       'type': 'static_library',
       'dependencies': [
         '../../skia/skia.gyp:skia',
         '../../testing/gtest.gyp:gtest',
         '../events/events.gyp:events',
         '../gfx/gfx.gyp:gfx',
         '../ui.gyp:ui',
-        '../ui.gyp:ui_test_support',
+        '../ui_unittests.gyp:ui_test_support',
         'aura',
         'aura_test_support_pak',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
         'test/aura_test_base.cc',
         'test/aura_test_base.h',
         'test/aura_test_helper.cc',
@@ skipping 117 matching lines @@
         '../../chrome/chrome_resources.gyp:packed_resources',
         '../../skia/skia.gyp:skia',
         '../../testing/gtest.gyp:gtest',
         '../compositor/compositor.gyp:compositor_test_support',
         '../compositor/compositor.gyp:compositor',
         '../events/events.gyp:events',
         '../gfx/gfx.gyp:gfx',
         '../gl/gl.gyp:gl',
         '../ui.gyp:ui',
         '../ui.gyp:ui_resources',
-        '../ui.gyp:ui_test_support',
+        '../ui_unittests.gyp:ui_test_support',
         'aura_test_support',
         'aura',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
         'gestures/gesture_recognizer_unittest.cc',
         'test/run_all_unittests.cc',
         'test/test_suite.cc',
@@ skipping 11 matching lines @@
         ['OS=="linux" and linux_use_tcmalloc==1', {
           'dependencies': [
            # See http://crbug.com/162998#c4 for why this is needed.
             '../../base/allocator/allocator.gyp:allocator',
           ],
         }],
       ],
     },
   ],
 }