Fix android depfiles to always list GN's outputs[0]

build/protoc_java.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.
 
 """Generate java source files from protobuf files.
 
 This is a helper file for the genproto_java action in protoc_java.gypi.
 
 It performs the following steps:
@@ skipping 39 matching lines @@
         [options.protoc, '--proto_path', options.proto_path, out_arg]
         + args)
 
     if options.java_out_dir:
       build_utils.DeleteDirectory(options.java_out_dir)
       shutil.copytree(temp_dir, options.java_out_dir)
     else:
       build_utils.ZipDir(options.srcjar, temp_dir)
 
   if options.depfile:
-    build_utils.WriteDepfile(
-        options.depfile,
-        args + [options.protoc] + build_utils.GetPythonDependencies())
+    assert options.srcjar
+    deps = args + [options.protoc]
+    build_utils.WriteDepfile(options.depfile, options.srcjar, deps)
 
   if options.stamp:
     build_utils.Touch(options.stamp)
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))