GCAPI should append to the existing experiment_labels instead of clobbering them.

chrome/installer/gcapi/gcapi_test.cc

 // Copyright (c) 2012 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 <stdio.h>
 
+#include "base/at_exit.h"
 #include "base/command_line.h"
 #include "chrome/installer/gcapi/gcapi.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 void call_statically() {
   DWORD reason = 0;
   BOOL result_flag_on = FALSE;
   BOOL result_flag_off = FALSE;
 
   // running this twice verifies that the first call does not set
@@ skipping 36 matching lines @@
            result_flag_on, reason);
   } else {
     printf("Couldn't find GoogleChromeCompatibilityCheck() in gcapi_dll.\n");
   }
   FreeLibrary(module);
 }
 
 const char kManualLaunchTests[] = "launch-chrome";
 
 int main(int argc, char* argv[]) {
+  base::AtExitManager exit_manager;
   CommandLine::Init(argc, argv);
 
   testing::InitGoogleTest(&argc, argv);
   RUN_ALL_TESTS();
 
   if (CommandLine::ForCurrentProcess()->HasSwitch(kManualLaunchTests)) {
     call_dynamically();
     call_statically();
     printf("LaunchChrome returned %d.\n", LaunchGoogleChrome());
   }
 }