Move sandboxed_unpacker.{h,cc} from chrome/ to extensions/

extensions/extensions_tests.gyp

 {
   'variables': {
     # Product name is used for Mac bundle.
     'app_shell_product_name': 'App Shell',
     # The version is high enough to be supported by Omaha (at least 31)
     # but fake enough to be obviously not a Chrome release.
     'app_shell_version': '38.1234.5678.9',
     'chromium_code': 1,
   },
   'targets': [
@@ skipping 72 matching lines @@
         'browser/image_loader_unittest.cc',
         'browser/info_map_unittest.cc',
         'browser/lazy_background_task_queue_unittest.cc',
         'browser/management_policy_unittest.cc',
         'browser/mojo/keep_alive_impl_unittest.cc',
         'browser/mojo/stash_backend_unittest.cc',
         'browser/process_manager_unittest.cc',
         'browser/process_map_unittest.cc',
         'browser/quota_service_unittest.cc',
         'browser/runtime_data_unittest.cc',
+        'browser/sandboxed_unpacker_unittest.cc',
         'browser/value_store/leveldb_value_store_unittest.cc',
         'browser/value_store/testing_value_store_unittest.cc',
         'browser/value_store/value_store_change_unittest.cc',
         'browser/value_store/value_store_frontend_unittest.cc',
         'browser/value_store/value_store_unittest.cc',
         'browser/value_store/value_store_unittest.h',
         'browser/verified_contents_unittest.cc',
         'browser/warning_service_unittest.cc',
         'common/api/sockets/sockets_manifest_permission_unittest.cc',
         'common/csp_validator_unittest.cc',
@@ skipping 140 matching lines @@
             '../build/isolate.gypi',
           ],
           'sources': [
             'extensions_browsertests.isolate',
           ],
         },
       ],
     }],
   ],
 }