Fix handling of spaces with paths in copy_test_data.py

build/copy_test_data_ios.gypi

 # 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.
 
 # This file is meant to be included into an action to copy test data files into
 # an iOS app bundle. To use this the following variables need to be defined:
 #   test_data_files: list: paths to test data files or directories
 #   test_data_prefix: string: a directory prefix that will be prepended to each
 #                             output path.  Generally, this should be the base
 #                             directory of the gypi file containing the unittest
@@ skipping 25 matching lines @@
   'inputs': [
     '<!@pymod_do_main(copy_test_data_ios --inputs <(test_data_files))',
   ],
   'outputs': [
     '<!@pymod_do_main(copy_test_data_ios -o <(PRODUCT_DIR)/<(_target_name).app/<(test_data_prefix) --outputs <(test_data_files))',
   ],
   'action': [
     'python',
     '<(DEPTH)/build/copy_test_data_ios.py',
     '-o', '<(PRODUCT_DIR)/<(_target_name).app/<(test_data_prefix)',
-    '<(_inputs)',
+    '<@(_inputs)',
   ],
 }