EDK: Make ConnectionManagerTest not use base::MessageLoop/RunLoop.

mojo/edk/system/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("../mojo_edk.gni")
 import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
@@ skipping 157 matching lines @@
   ]
 
   deps = [
     ":system",
     "//base",
     "//testing/gtest",
   ]
 
   mojo_edk_deps = [
     "mojo/edk/base_edk",
+    "mojo/edk/base_edk:test_base_edk",
     "mojo/edk/system/test",
     "mojo/edk/test:test_support",
     "mojo/edk/util",
   ]
 }
 
 mojo_edk_perftests("mojo_edk_system_perftests") {
   sources = [
     "message_pipe_perftest.cc",
     "message_pipe_test_utils.cc",
     "message_pipe_test_utils.h",
   ]
 
   deps = [
     ":system",
     "//base",
     "//testing/gtest",
   ]
 
   mojo_edk_deps = [
     # TODO(vtl): Add separate test targets for this.
     "mojo/edk/util:perftests",
 
     "mojo/edk/system/test",
     "mojo/edk/system/test:perf",
     "mojo/edk/test:test_support",
   ]
 }