Revert of Move gn _run target generation into test().

chrome/test/chromedriver/BUILD.gn

 # Copyright 2015 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.
 
 import("//build/config/ui.gni")
 import("//chrome/chrome_tests.gni")
 import("//testing/test.gni")
 
 # GYP version: chrome/chrome_tests.gypi:automation_client_lib
 #              (embed_js_in_cpp action)
@@ skipping 172 matching lines @@
 
   # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
   configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 
   deps = [
     ":lib",
     "//build/config/sanitizers:deps",
   ]
 }
 
+# TODO(GYP): Delete this after we've converted everything to GN.
+# The _run targets exist only for compatibility w/ GYP.
+group("chromedriver_unittests_run") {
+  testonly = true
+  deps = [
+    ":chromedriver_unittests",
+  ]
+}
+
 test("chromedriver_unittests") {
   sources =
       rebase_path(chrome_tests_gypi_values.chrome_driver_unittests_sources,
                   ".",
                   "//chrome")
 
   # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
   configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 
   data = [
@@ skipping 27 matching lines @@
     ":lib",
     "//base",
     "//base/test:run_all_unittests",
     "//net",
     "//net:http_server",
     "//net:test_support",
     "//testing/gtest",
     "//url",
   ]
 }