base::Bind: Cleanup in automation.

base/message_loop.h

Index: base/message_loop.h
diff --git a/base/message_loop.h b/base/message_loop.h
index 29c736c25aafdaaccbbc7b3e7d0b7554384cb2f4..adb58e3714ee34c4f1edea22308036f689d59819 100644
--- a/base/message_loop.h
+++ b/base/message_loop.h
@@ -242,11 +242,10 @@ class BASE_EXPORT MessageLoop : public base::MessagePump::Delegate {
   // messages.  This method may only be called on the same thread that called
   // Run, and Run must still be on the call stack.
   //
-  // Use QuitTask if you need to Quit another thread's MessageLoop, but note
-  // that doing so is fairly dangerous if the target thread makes nested calls
-  // to MessageLoop::Run.  The problem being that you won't know which nested
-  // run loop you are quiting, so be careful!
-  //
+  // Use QuitTask or QuitClosure if you need to Quit another thread's
+  // MessageLoop, but note that doing so is fairly dangerous if the target
+  // thread makes nested calls to MessageLoop::Run.  The problem being that you
+  // won't know which nested run loop you are quitting, so be careful!
   void Quit();
 
   // This method is a variant of Quit, that does not wait for pending messages
@@ -255,6 +254,7 @@ class BASE_EXPORT MessageLoop : public base::MessagePump::Delegate {
 
   // Invokes Quit on the current MessageLoop when run.  Useful to schedule an
   // arbitrary MessageLoop to Quit.
+  // TODO(jhawkins): Remove once task.h is removed.
   class QuitTask : public Task {
    public:
     virtual void Run() {
@@ -262,6 +262,10 @@ class BASE_EXPORT MessageLoop : public base::MessagePump::Delegate {
     }
   };
 
+  // Invokes Quit on the current MessageLoop when run. Useful to schedule an
+  // arbitrary MessageLoop to Quit.
+  static base::Closure QuitClosure();
+
   // Returns the type passed to the constructor.
   Type type() const { return type_; }