Use _target_name instead of package_name for java*.gypi

ui/ui.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': {
     'chromium_code': 1,
   },
   'includes': [
     'ui_resources.gypi',
@@ skipping 867 matching lines @@
            ],
            'variables': {
              'jni_gen_dir': 'ui',
            },
            'includes': [ '../build/jni_generator.gypi' ],
          },
          {
            'target_name': 'ui_java',
            'type': 'none',
            'variables': {
-             'package_name': 'ui',
              'java_in_dir': '../ui/android/java',
            },
            'dependencies': [
              '../base/base.gyp:base_java',
            ],
            'includes': [ '../build/java.gypi' ],
          },
        ],
     }],
   ],
 }