Update harfbuzz-ng to 1a5a91dc0d8bf4b72a2f22dc6300b06ad7000b79.

third_party/harfbuzz/harfbuzz.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': {
     # Set to 1 to use Harfbuzz-NG instead of Harfbuzz.
     # Under development: http://crbug.com/68551
     'use_harfbuzz_ng%': 0
   },
@@ skipping 53 matching lines @@
         },
       ],
     }, {  # else, use new harfbuzz
       'targets': [
         {
           # Make the 'harfbuzz' target just shim through to the harfbuzz-ng
           # one.
           'target_name': 'harfbuzz',
           'type': 'none',
           'dependencies': [
-            '../harfbuzz-ng/harfbuzz.gyp:harfbuzz'
+            '../harfbuzz-ng/harfbuzz.gyp:harfbuzz-ng'
           ],
           'export_dependent_settings': [
-            '../harfbuzz-ng/harfbuzz.gyp:harfbuzz'
+            '../harfbuzz-ng/harfbuzz.gyp:harfbuzz-ng'
           ],
         }
       ]
     }]
   ]
 }