EDK: Make mojo::platform::TaskRunner's PostTask() take an std::function<void()>.

mojo/edk/system/channel_manager.h

Index: mojo/edk/system/channel_manager.h
diff --git a/mojo/edk/system/channel_manager.h b/mojo/edk/system/channel_manager.h
index 77efea753479e4fb70daab0ce511a24319a3955e..d91a8541625efb422660b074ddfc8c34375f1913 100644
--- a/mojo/edk/system/channel_manager.h
+++ b/mojo/edk/system/channel_manager.h
@@ -122,13 +122,6 @@ class ChannelManager {
   ConnectionManager* connection_manager() const { return connection_manager_; }
 
  private:
-  // Used by |Shutdown()|. Called on the I/O thread.
-  // TODO(vtl): |callback_thread_task_runner| should be an rvalue reference, but
-  // that doesn't work with |base::Bind()|.
-  void ShutdownHelper(
-      const base::Closure& callback,
-      util::RefPtr<platform::TaskRunner> callback_thread_task_runner);
-
   // Used by |CreateChannelOnIOThread()| and |CreateChannelHelper()|. Called on
   // the I/O thread. |bootstrap_channel_endpoint| is optional and may be null.
   // Returns the newly-created |Channel|.