Use _target_name instead of package_name for java*.gypi

chrome/browser/component/web_contents_delegate_android/web_contents_delegate_android.gypi

 # 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.
 
 {
   'conditions': [
     ['OS=="android"', {
       'targets': [
         {
@@ skipping 22 matching lines @@
           ],
         },
         {
           'target_name': 'web_contents_delegate_android_java',
           'type': 'none',
           'dependencies': [
             '<(DEPTH)/base/base.gyp:base',
             '<(DEPTH)/content/content.gyp:content_java',
           ],
           'variables': {
-            'package_name': 'web_contents_delegate_android',
             'java_in_dir': 'java',
           },
           'includes': [ '../../../../build/java.gypi' ],
         },
       ],
     }],
   ],
 }