Remove kChildCleanExit since it's not used anymore.

content/browser/browser_child_process_host_impl.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 "content/browser/browser_child_process_host_impl.h"
 
 #include "base/base_switches.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
@@ skipping 126 matching lines @@
       cmd_line, data_.id);
 
   const CommandLine& browser_command_line = *CommandLine::ForCurrentProcess();
   static const char* kForwardSwitches[] = {
     switches::kDisableLogging,
     switches::kEnableLogging,
     switches::kLoggingLevel,
     switches::kTraceToConsole,
     switches::kV,
     switches::kVModule,
-#if defined(OS_POSIX)
-    switches::kChildCleanExit,
-#endif
 #if defined(OS_WIN)
     switches::kEnableHighResolutionTime,
 #endif
   };
   cmd_line->CopySwitchesFrom(browser_command_line, kForwardSwitches,
                              arraysize(kForwardSwitches));
 
   child_process_.reset(new ChildProcessLauncher(
       delegate,
       cmd_line,
@@ skipping 190 matching lines @@
 
 void BrowserChildProcessHostImpl::OnProcessExitedEarly(
     base::WaitableEvent* event) {
   DeleteProcessWaitableEvent(event);
   OnChildDisconnected();
 }
 
 #endif
 
 }  // namespace content