Remove kChildCleanExit since it's not used anymore.

content/browser/child_process_launcher.cc

Index: content/browser/child_process_launcher.cc
===================================================================
--- content/browser/child_process_launcher.cc	(revision 260245)
+++ content/browser/child_process_launcher.cc	(working copy)
@@ -58,17 +58,12 @@
         client_thread_id_(BrowserThread::UI),
         termination_status_(base::TERMINATION_STATUS_NORMAL_TERMINATION),
         exit_code_(RESULT_CODE_NORMAL_EXIT),
-        starting_(true)
+        starting_(true),
+        terminate_child_on_shutdown_(true)
 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
         , zygote_(false)
 #endif
         {
-#if defined(OS_POSIX)
-          terminate_child_on_shutdown_ = !CommandLine::ForCurrentProcess()->
-              HasSwitch(switches::kChildCleanExit);
-#else
-          terminate_child_on_shutdown_ = true;
-#endif
   }
 
   void Launch(
@@ -499,7 +494,7 @@
 }
 
 void ChildProcessLauncher::SetTerminateChildOnShutdown(
-  bool terminate_on_shutdown) {
+    bool terminate_on_shutdown) {
   if (context_.get())
     context_->set_terminate_child_on_shutdown(terminate_on_shutdown);
 }