Add missing copyright statement to ui_strings.gyp.

ui/base/strings/ui_strings.gyp

+# Copyright 2013 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,
     'grit_base_out_dir': '<(SHARED_INTERMEDIATE_DIR)/ui',
   },
   'targets': [
     {
       'target_name': 'ui_strings',
       'type': 'none',
       'actions': [
@@ skipping 65 matching lines @@
             'destination': '<(PRODUCT_DIR)/ui_unittests_strings',
             'files': [
               '<(grit_base_out_dir)/ui_resources/ui_resources_100_percent.pak',
             ],
           },
         ],
       }],
     }],
   ],
 }