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

mojo/edk/system/slave_connection_manager.cc

Index: mojo/edk/system/slave_connection_manager.cc
diff --git a/mojo/edk/system/slave_connection_manager.cc b/mojo/edk/system/slave_connection_manager.cc
index 2f842f4d9e377e22664e18e424f92bb8524f80fa..c147dca8be1904223b9b16f1e82ec0ffec0e8f9d 100644
--- a/mojo/edk/system/slave_connection_manager.cc
+++ b/mojo/edk/system/slave_connection_manager.cc
@@ -327,9 +327,12 @@ void SlaveConnectionManager::OnError(Error error) {
   raw_channel_.reset();
 
   DCHECK(slave_process_delegate_);
-  delegate_thread_task_runner_->PostTask(
-      base::Bind(&embedder::SlaveProcessDelegate::OnMasterDisconnect,
-                 base::Unretained(slave_process_delegate_)));
+  // TODO(vtl): With C++14 lambda captures, we'll be able to avoid this
+  // nonsense.
+  auto slave_process_delegate = slave_process_delegate_;
+  delegate_thread_task_runner_->PostTask([slave_process_delegate]() {
+    slave_process_delegate->OnMasterDisconnect();
+  });
 }
 
 void SlaveConnectionManager::AssertNotOnPrivateThread() const {