Make --gtest_list_tests work again for unit tests.

base/test/launcher/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/test_launcher.h"
 
 #if defined(OS_POSIX)
 #include <fcntl.h>
 #endif
 
@@ skipping 534 matching lines @@
       }
     } else {
       OnTestIterationFinished();
     }
   }
 }
 
 bool TestLauncher::Init() {
   const CommandLine* command_line = CommandLine::ForCurrentProcess();
 
-  if (command_line->HasSwitch(kGTestListTestsFlag)) {
-    // Child gtest processes would list tests instead of running tests.
-    // TODO(phajdan.jr): Restore support for the flag.
-    LOG(ERROR) << kGTestListTestsFlag << " is not supported.";
-    return false;
-  }
-
   // Initialize sharding. Command line takes precedence over legacy environment
   // variables.
   if (command_line->HasSwitch(switches::kTestLauncherTotalShards) &&
       command_line->HasSwitch(switches::kTestLauncherShardIndex)) {
     if (!StringToInt(
             command_line->GetSwitchValueASCII(
                 switches::kTestLauncherTotalShards),
             &total_shards_)) {
       LOG(ERROR) << "Invalid value for " << switches::kTestLauncherTotalShards;
       return false;
@@ skipping 439 matching lines @@
 
     g_live_processes.Get().erase(process_handle);
   }
 
   base::CloseProcessHandle(process_handle);
 
   return exit_code;
 }
 
 }  // namespace base