Fix .so-file enumeration in generate_gradle.py.

build/android/gradle/generate_gradle.py

 #!/usr/bin/env python
 # Copyright 2016 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.
 
 """Generates an Android Studio project from a GN target."""
 
 import argparse
 import codecs
 import glob
@@ skipping 231 matching lines @@
       jinja_processor, split_projects):
     self.project_dir = project_dir
     self.build_vars = build_vars
     self.use_gradle_process_resources = use_gradle_process_resources
     self.jinja_processor = jinja_processor
     self.split_projects = split_projects
 
   def _GenJniLibs(self, root_entry):
     libraries = []
     for entry in self._GetEntries(root_entry):
-      libraries += entry.BuildConfig().get('native', [])
+      libraries += entry.BuildConfig().get('native', {}).get('libraries', [])
     if libraries:
       return _CreateJniLibsDir(constants.GetOutDirectory(),
           self.EntryOutputDir(root_entry), libraries)
     return []
 
   def _GenJavaDirs(self, root_entry):
     java_files = []
     for entry in self._GetEntries(root_entry):
       java_files += entry.JavaFiles()
     java_dirs, excludes = _ComputeJavaSourceDirsAndExcludes(
@@ skipping 474 matching lines @@
     _ExtractZips(generator.project_dir, zip_tuples)
 
   logging.warning('Project created! (%d subprojects)', len(project_entries))
   logging.warning('Generated projects work best with Android Studio 2.2')
   logging.warning('For more tips: https://chromium.googlesource.com/chromium'
                   '/src.git/+/master/docs/android_studio.md')
 
 
 if __name__ == '__main__':
   main()