On Posix, make all child processes quit when the browser dies, not just the renderers.

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/bind.h"
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/lazy_instance.h"
@@ skipping 103 matching lines @@
 #elif defined(OS_POSIX)
     bool use_zygote,
     const base::EnvironmentVector& environ,
 #endif
     CommandLine* cmd_line) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
   content::GetContentClient()->browser()->AppendExtraCommandLineSwitches(
       cmd_line, data_.id);
 
+#if defined(OS_POSIX)
+  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kChildCleanExit))
+    cmd_line->AppendSwitch(switches::kChildCleanExit);
+#endif
+
   child_process_.reset(new ChildProcessLauncher(
 #if defined(OS_WIN)
       exposed_dir,
 #elif defined(OS_POSIX)
       use_zygote,
       environ,
       child_process_host_->TakeClientFileDescriptor(),
 #endif
       cmd_line,
       this));
@@ skipping 117 matching lines @@
 }
 
 void BrowserChildProcessHostImpl::OnProcessLaunched() {
   if (!child_process_->GetHandle()) {
     delete delegate_;  // Will delete us
     return;
   }
   data_.handle = child_process_->GetHandle();
   delegate_->OnProcessLaunched();
 }