Have content/ create and destroy its own threads.

chrome/browser/ui/browser_list.cc

Index: chrome/browser/ui/browser_list.cc
diff --git a/chrome/browser/ui/browser_list.cc b/chrome/browser/ui/browser_list.cc
index daaead65e414840c0c2c728f111c15a82183655a..6827139aa6d59fae377489df8bef507e8bfd65df 100644
--- a/chrome/browser/ui/browser_list.cc
+++ b/chrome/browser/ui/browser_list.cc
@@ -20,6 +20,7 @@
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/pref_names.h"
 #include "content/browser/tab_contents/navigation_details.h"
+#include "content/public/browser/browser_shutdown.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/render_process_host.h"
@@ -548,7 +549,12 @@ void BrowserList::ExitCleanly() {
 }
 #endif
 
-static void TimeLimitedSessionEnding() {
+// static
+void BrowserList::SessionEnding() {
+  // This is a time-limited shutdown where we need to write as much to
+  // disk as we can as soon as we can, and where we must kill the
+  // process within a hang timeout to avoid user prompts.
+
   // Start watching for hang during shutdown, and crash it if takes too long.
   // We disarm when |shutdown_watcher| object is destroyed, which is when we
   // exit this function.
@@ -582,23 +588,8 @@ static void TimeLimitedSessionEnding() {
       content::NotificationService::AllSources(),
       content::NotificationService::NoDetails());
 
-  // And shutdown.
-  browser_shutdown::Shutdown();
-}
-
-// static
-void BrowserList::SessionEnding() {
-  TimeLimitedSessionEnding();
-
-#if defined(OS_WIN)
-  // At this point the message loop is still running yet we've shut everything
-  // down. If any messages are processed we'll likely crash. Exit now.
-  ExitProcess(content::RESULT_CODE_NORMAL_EXIT);
-#elif defined(OS_POSIX) && !defined(OS_MACOSX)
-  _exit(content::RESULT_CODE_NORMAL_EXIT);
-#else
-  NOTIMPLEMENTED();
-#endif
+  // This will end by terminating the process.
+  content::ImmediateShutdownAndExitProcess();
 }
 
 // static