[Cronet] Use gn desc deps to find third_party licenses.

components/cronet.gypi

 # Copyright 2014 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.
 
 {
   'conditions': [
     ['OS=="android"', {
       'targets': [
         {
           'target_name': 'cronet_jni_headers',
@@ skipping 716 matching lines @@
           },
           'actions': [
             {
               'action_name': 'version_header',
               'message': 'Generating version header file: <@(_outputs)',
               'inputs': [
                 '<(version_path)',
                 'cronet/version.h.in',
               ],
               'outputs': [
-                '<(SHARED_INTERMEDIATE_DIR)/components/cronet/version.h',
+                '<(SHARED_INTERMEDIATE_DIR)/components/cronet/ios/version.h',
               ],
               'action': [
                 'python',
                 '<(version_py_path)',
                 '-e', 'VERSION_FULL="<(version_full)"',
                 'cronet/version.h.in',
                 '<@(_outputs)',
               ],
               'includes': [
                 '../build/util/version.gypi',
@@ skipping 184 matching lines @@
                   'cronet/ios/test/cronet_bidirectional_stream_test.mm',
                   'cronet/ios/test/cronet_test_runner.mm',
                 ],
               },
             ],
           },
       ],
     }],  # OS=="ios"
   ],
 }