Use _target_name instead of package_name for java*.gypi

chrome/chrome.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,
 
     # Define the common dependencies that contain all the actual
     # Chromium functionality.  This list gets pulled in below by
     # the link of the actual chrome (or chromium) executable on
@@ skipping 1069 matching lines @@
           'dependencies': [
             '../base/base.gyp:base',
             '../components/components.gyp:navigation_interception_java',
             '../components/components.gyp:web_contents_delegate_android_java',
             '../content/content.gyp:content_java',
             '../sync/sync.gyp:sync_java',
             '../third_party/guava/guava.gyp:guava_javalib',
             '../ui/ui.gyp:ui_java',
           ],
           'variables': {
-            'package_name': 'chrome',
             'java_in_dir': '../chrome/android/java',
             'has_java_resources': 1,
             'R_package': 'org.chromium.chrome',
             'R_package_relpath': 'org/chromium/chrome',
             'java_strings_grd': 'android_chrome_strings.grd',
           },
           'includes': [
             '../build/java.gypi',
           ],
         },
       ], # 'targets'
       'includes': [
         'chrome_android.gypi',
       ]}, # 'includes'
     ],  # OS=="android"
   ],  # 'conditions'
 }