Added code so renderer would cleanly exit.

chrome/renderer/chrome_render_process_observer.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 "chrome/renderer/chrome_render_process_observer.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/message_loop.h"
@@ skipping 144 matching lines @@
     // processed (because that message loop is stuck in V8).
     //
     // One could make the browser SIGKILL the renderers, but that leaves open a
     // large window where a browser failure (or a user, manually terminating
     // the browser because "it's stuck") will leave behind a process eating all
     // the CPU.
     //
     // So, we install a filter on the channel so that we can process this event
     // here and kill the process.
 
-    _exit(0);
+    if (CommandLine::ForCurrentProcess()->
+        HasSwitch(switches::kEnableRendererCleanExit))
+      alarm(30);
+    else
+      _exit(0);
   }
 };
 #endif  // OS_POSIX
 
 }  // namespace
 
 bool ChromeRenderProcessObserver::is_incognito_process_ = false;
 
 ChromeRenderProcessObserver::ChromeRenderProcessObserver(
     chrome::ChromeContentRendererClient* client)
@@ skipping 198 matching lines @@
   if (clear_cache_pending_) {
     clear_cache_pending_ = false;
     WebCache::clear();
   }
 }
 
 const RendererContentSettingRules*
 ChromeRenderProcessObserver::content_setting_rules() const {
   return &content_setting_rules_;
 }