Enable icu_use_data_file on Windows

base/base.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,
   },
   'includes': [
     '../build/win_precompile.gypi',
@@ skipping 777 matching lines @@
             'message_loop/message_pump_glib_unittest.cc',
           ]
         }],
         ['OS == "linux" and linux_use_tcmalloc==1', {
             'dependencies': [
               'allocator/allocator.gyp:allocator',
             ],
           },
         ],
         ['OS == "win"', {
-          # This is needed to trigger the dll copy step on windows.
-          # TODO(mark): This should not be necessary.
-          'dependencies': [
-            '../third_party/icu/icu.gyp:icudata',
+          'conditions': [
+            ['icu_use_data_file_flag==0', {
+              # This is needed to trigger the dll copy step on windows.
+              # TODO(mark): This should not be necessary.
+              'dependencies': [
+                '../third_party/icu/icu.gyp:icudata',
+              ],
+            }],
           ],
           'sources!': [
             'file_descriptor_shuffle_unittest.cc',
             'files/dir_reader_posix_unittest.cc',
             'threading/worker_pool_posix_unittest.cc',
             'message_loop/message_pump_libevent_unittest.cc',
           ],
           # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
           'msvs_disabled_warnings': [
             4267,
@@ skipping 588 matching lines @@
             'base_unittests.isolate',
           ],
           'sources': [
             'base_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }