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

google_apis/gcm/BUILD.gn

 # Copyright 2014 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("//testing/test.gni")
 import("//third_party/protobuf/proto_library.gni")
 
 component("gcm") {
   sources = [
     "base/gcm_util.cc",
@@ skipping 105 matching lines @@
     ":gcm",
     ":test_support",
     "//base",
     "//build/config/sanitizers:deps",
     "//net",
     "//net:test_support",
     "//third_party/protobuf:protobuf_lite",
   ]
 }
 
+# TODO(GYP): Delete this after we've converted everything to GN.
+# The _run targets exist only for compatibility w/ GYP.
+group("gcm_unit_tests_run") {
+  testonly = true
+  deps = [
+    ":gcm_unit_tests",
+  ]
+}
+
 test("gcm_unit_tests") {
   sources = [
     "base/mcs_message_unittest.cc",
     "base/mcs_util_unittest.cc",
     "base/socket_stream_unittest.cc",
     "engine/account_mapping_unittest.cc",
     "engine/checkin_request_unittest.cc",
     "engine/connection_factory_impl_unittest.cc",
     "engine/connection_handler_impl_unittest.cc",
     "engine/gcm_request_test_base.cc",
@@ skipping 10 matching lines @@
     ":gcm",
     ":test_support",
     "//base",
     "//base/test:run_all_unittests",
     "//net",
     "//net:test_support",
     "//testing/gtest",
     "//third_party/protobuf:protobuf_lite",
   ]
 }