ninja&make/mac: Convert .strings files to UTF-16LE, not just UTF-16.

test/mac/gyptest-app.py

 #!/usr/bin/env python
 
 # Copyright (c) 2012 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """
 Verifies that app bundles are built correctly.
 """
 
@@ skipping 24 matching lines @@
                              chdir='app-bundle')
 
   # Info.plist
   info_plist = test.built_file_path('Test App Gyp.app/Contents/Info.plist',
                                     chdir='app-bundle')
   test.must_exist(info_plist)
   test.must_contain(info_plist, 'com.google.Test App Gyp')  # Variable expansion
   test.must_not_contain(info_plist, '${MACOSX_DEPLOYMENT_TARGET}');
 
   # Resources
-  test.built_file_must_exist(
+  strings = test.built_file_path(
       'Test App Gyp.app/Contents/Resources/English.lproj/InfoPlist.strings',
       chdir='app-bundle')
+  test.must_exist(strings)
+  # Xcodes writes UTF-16LE with BOM.
+  test.must_contain(strings, '\xff\xfe' + '/* Localized'.encode('utf-16le'))
+
   test.built_file_must_exist(
       'Test App Gyp.app/Contents/Resources/English.lproj/MainMenu.nib',
       chdir='app-bundle')
 
   # Packaging
   test.built_file_must_exist('Test App Gyp.app/Contents/PkgInfo',
                              chdir='app-bundle')
   test.built_file_must_match('Test App Gyp.app/Contents/PkgInfo', 'APPLause',
                              chdir='app-bundle')
 
   # Check that no other files get added to the bundle.
   if set(ls(test.built_file_path('Test App Gyp.app', chdir='app-bundle'))) != \
      set(['Contents/MacOS/Test App Gyp',
           'Contents/Info.plist',
           'Contents/Resources/English.lproj/InfoPlist.strings',
           'Contents/Resources/English.lproj/MainMenu.nib',
           'Contents/PkgInfo',
           ]):
     test.fail_test()
 
   test.pass_test()