Use _target_name instead of package_name for java*.gypi

chrome/chrome_tests.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.
 {
   'variables' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 4881 matching lines @@
           'type': 'none',
           'dependencies': [
             '../base/base.gyp:base',
             '../base/base.gyp:base_java_test_support',
             'chrome_java',
             'chromium_testshell_java',
             '../content/content.gyp:content_java_test_support',
             '../tools/android/forwarder/forwarder.gyp:forwarder',
           ],
           'variables': {
-            'package_name': 'chromium_testshell_test',
             'apk_name': 'ChromiumTestShellTest',
             'java_in_dir': './android/testshell/javatests',
             'resource_dir': '../res',
             'additional_src_dirs': ['android/javatests/src'],
           },
           'includes': [ '../build/java_apk.gypi' ],
         },
       ],
     }],
     ['test_isolation_mode != "noop"', {
@@ skipping 44 matching lines @@
             'sync_integration_tests.isolate',
           ],
           'sources': [
             'sync_integration_tests.isolate',
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }