[Cronet] Use gn desc to find third party licenses on Android.

tools/licenses.py

 #!/usr/bin/env python
 # 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.
 
 """Utility for checking and processing licensing information in third_party
 directories.
 
 Usage: licenses.py <command>
 
@@ skipping 475 matching lines @@
     """Returns third_party/foo directories given the output of "gn desc deps".
 
     Note that it always returns the direct sub-directory of third_party
     where README.chromium and LICENSE files are, so that it can be passed to
     ParseDir(). e.g.:
         .../third_party/cld_3/src/src/BUILD.gn -> .../third_party/cld_3
     """
     third_party_deps = set()
     for build_dep in gn_deps.split():
         m = re.search(r'^(.+/third_party/[^/]+)/(.+/)?BUILD\.gn$', build_dep)
-        if m:
+        if m and not os.path.join('build', 'secondary') in build_dep:
             third_party_deps.add(m.group(1))
     return third_party_deps
 
 
 def FindThirdPartyDeps(gn_out_dir, gn_target):
     if not gn_out_dir:
         raise RuntimeError("--gn-out-dir is required if --gn-target is used.")
 
     # Generate gn project in temp directory and use it to find dependencies.
     # Current gn directory cannot be used when we run this script in a gn action
@@ skipping 225 matching lines @@
         if not GenerateLicenseFile(
                 args.output_file, args.gn_out_dir, args.gn_target):
             return 1
     else:
         print __doc__
         return 1
 
 
 if __name__ == '__main__':
   sys.exit(main())