Add WorkerPool::PostTaskAndReply and use in DHCP code.

base/threading/post_task_and_reply_impl.cc

Index: base/threading/post_task_and_reply_impl.cc
diff --git a/base/message_loop_proxy.cc b/base/threading/post_task_and_reply_impl.cc
similarity index 92%
copy from base/message_loop_proxy.cc
copy to base/threading/post_task_and_reply_impl.cc
index c8217042fe6a540c2df3309d59a3caf7c1a389a2..192198b8373aa4f5ca690ddafb69edbe05170226 100644
--- a/base/message_loop_proxy.cc
+++ b/base/threading/post_task_and_reply_impl.cc
@@ -2,10 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "base/message_loop_proxy.h"
+#include "base/threading/post_task_and_reply_impl.h"
 
 #include "base/bind.h"
 #include "base/location.h"
+#include "base/message_loop_proxy.h"
 
 namespace base {
 
@@ -67,13 +68,9 @@ class PostTaskAndReplyRelay {
 
 }  // namespace
 
-MessageLoopProxy::MessageLoopProxy() {
-}
-
-MessageLoopProxy::~MessageLoopProxy() {
-}
+namespace internal {
 
-bool MessageLoopProxy::PostTaskAndReply(
+bool PostTaskAndReplyImpl::PostTaskAndReply(
     const tracked_objects::Location& from_here,
     const Closure& task,
     const Closure& reply) {
@@ -88,8 +85,6 @@ bool MessageLoopProxy::PostTaskAndReply(
   return true;
 }
 
-void MessageLoopProxy::OnDestruct() const {
-  delete this;
-}
+}  // namespace internal
 
 }  // namespace base