GTTF: Detect browser crashes on shutdown in UI tests.

chrome/test/out_of_proc_test_runner.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 <string>
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/environment.h"
 #include "base/file_util.h"
@@ skipping 383 matching lines @@
 #if defined(OS_POSIX)
   if (exit_code != 0) {
     // On POSIX, in case the test does not exit cleanly, either due to a crash
     // or due to it timing out, we need to clean up any child processes that
     // it might have created. On Windows, child processes are automatically
     // cleaned up using JobObjects.
     base::KillProcessGroup(process_handle);
   }
 #endif
 
+  base::CloseProcessHandle(process_handle);
+
   return exit_code;
 }
 
 bool RunTests(bool should_shard, int total_shards, int shard_index) {
   const CommandLine* command_line = CommandLine::ForCurrentProcess();
 
   DCHECK(!command_line->HasSwitch(kGTestListTestsFlag));
 
   testing::UnitTest* const unit_test = testing::UnitTest::GetInstance();
 
@@ skipping 212 matching lines @@
       exit_code = 1;
       break;
     }
 
     // Special value "-1" means "repeat indefinitely".
     if (cycles != -1)
       cycles--;
   }
   return exit_code;
 }