Revert Change ServiceManagerConnectionImpl to run service request handlers on the IO thread

content/test/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("//build/config/chrome_build.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
@@ skipping 1347 matching lines @@
     "../common/page_zoom_unittest.cc",
     "../common/plugin_list_unittest.cc",
     "../common/quarantine/quarantine_linux_unittest.cc",
     "../common/quarantine/quarantine_mac_unittest.mm",
     "../common/quarantine/quarantine_win_unittest.cc",
     "../common/sandbox_mac_diraccess_unittest.mm",
     "../common/sandbox_mac_fontloading_unittest.mm",
     "../common/sandbox_mac_system_access_unittest.mm",
     "../common/sandbox_mac_unittest_helper.h",
     "../common/sandbox_mac_unittest_helper.mm",
-    "../common/service_manager/service_manager_connection_impl_unittest.cc",
     "../common/service_worker/service_worker_utils_unittest.cc",
     "../common/webplugininfo_unittest.cc",
     "../public/test/referrer_unittest.cc",
     "../renderer/android/disambiguation_popup_helper_unittest.cc",
     "../renderer/android/email_detector_unittest.cc",
     "../renderer/android/phone_number_detector_unittest.cc",
     "../renderer/bmp_image_decoder_unittest.cc",
     "../renderer/categorized_worker_pool_unittest.cc",
     "../renderer/device_sensors/device_light_event_pump_unittest.cc",
     "../renderer/device_sensors/device_motion_event_pump_unittest.cc",
@@ skipping 451 matching lines @@
   if (is_android) {
     deps += [ "//testing/android/native_test:native_test_native_code" ]
   }
 }
 
 group("fuzzers") {
   deps = [
     "//content/test/fuzzer",
   ]
 }