Make an empty content browser test work.

content/test/test_launcher.cc

 // Copyright (c) 2011 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 "content/test/test_launcher.h"
 
 #include <string>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 536 matching lines @@
 
   if (command_line->HasSwitch(kHelpFlag)) {
     PrintUsage();
     return 0;
   }
 
   int return_code = 0;
   if (launcher_delegate->Run(argc, argv, &return_code))
     return return_code;
 
+  base::AtExitManager at_exit;
+
   int32 total_shards;
   int32 shard_index;
   bool should_shard = ShouldShard(&total_shards, &shard_index);
 
   fprintf(stdout,
       "Starting tests...\n"
       "IMPORTANT DEBUGGING NOTE: each test is run inside its own process.\n"
       "For debugging a test inside a debugger, use the\n"
       "--gtest_filter=<your_test_name> flag along with either\n"
       "--single_process (to run all tests in one launcher/browser process) or\n"
@@ skipping 28 matching lines @@
     }
 
     // Special value "-1" means "repeat indefinitely".
     if (cycles != -1)
       cycles--;
   }
   return exit_code;
 }
 
 }  // namespace test_launcher