Run dbus_unittests serially.

base/test/launcher/unit_test_launcher.cc

 // Copyright 2013 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.
 
 #include "base/test/launcher/unit_test_launcher.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
@@ skipping 479 matching lines @@
   fprintf(stdout,
           "IMPORTANT DEBUGGING NOTE: batches of tests are run inside their\n"
           "own process. For debugging a test inside a debugger, use the\n"
           "--gtest_filter=<your_test_name> flag along with\n"
           "--single-process-tests.\n");
   fflush(stdout);
 
   MessageLoopForIO message_loop;
 
   UnitTestLauncherDelegate delegate(batch_limit);
-  base::TestLauncher launcher(&delegate, SysInfo::NumberOfProcessors());
+  base::TestLauncher launcher(&delegate, default_jobs);
   bool success = launcher.Run(argc, argv);
 
   fprintf(stdout,
           "Tests took %" PRId64 " seconds.\n",
           (base::TimeTicks::Now() - start_time).InSeconds());
   fflush(stdout);
 
   return (success ? 0 : 1);
 }
 
 }  // namespace
 
 int LaunchUnitTests(int argc,
                     char** argv,
                     const RunTestSuiteCallback& run_test_suite) {
   return LaunchUnitTestsInternal(
       argc, argv, run_test_suite, SysInfo::NumberOfProcessors());
 }
 
 int LaunchUnitTestsSerially(int argc,
                             char** argv,
                             const RunTestSuiteCallback& run_test_suite) {
   return LaunchUnitTestsInternal(argc, argv, run_test_suite, 1);
 }
 
 }  // namespace base