Rewrite base::Bind into base::BindOnce on trivial cases in base

base/message_loop/message_pump_libevent_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/message_loop/message_pump_libevent.h"
 
 #include <unistd.h>
 
 #include <memory>
 
@@ skipping 169 matching lines @@
 }
 
 class NestedPumpWatcher : public MessagePumpLibevent::Watcher {
  public:
   NestedPumpWatcher() {}
   ~NestedPumpWatcher() override {}
 
   void OnFileCanReadWithoutBlocking(int /* fd */) override {
     RunLoop runloop;
     ThreadTaskRunnerHandle::Get()->PostTask(
-        FROM_HERE, Bind(&QuitMessageLoopAndStart, runloop.QuitClosure()));
+        FROM_HERE, BindOnce(&QuitMessageLoopAndStart, runloop.QuitClosure()));
     runloop.Run();
   }
 
   void OnFileCanWriteWithoutBlocking(int /* fd */) override {}
 };
 
 TEST_F(MessagePumpLibeventTest, NestedPumpWatcher) {
   std::unique_ptr<MessagePumpLibevent> pump(new MessagePumpLibevent);
   MessagePumpLibevent::FileDescriptorWatcher watcher(FROM_HERE);
   NestedPumpWatcher delegate;
@@ skipping 10 matching lines @@
 
 class QuitWatcher : public BaseWatcher {
  public:
   QuitWatcher(MessagePumpLibevent::FileDescriptorWatcher* controller,
               RunLoop* run_loop)
       : BaseWatcher(controller), run_loop_(run_loop) {}
   ~QuitWatcher() override {}
 
   void OnFileCanReadWithoutBlocking(int /* fd */) override {
     // Post a fatal closure to the MessageLoop before we quit it.
-    ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE, Bind(&FatalClosure));
+    ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE, BindOnce(&FatalClosure));
 
     // Now quit the MessageLoop.
     run_loop_->Quit();
   }
 
  private:
   RunLoop* run_loop_;  // weak
 };
 
 void WriteFDWrapper(const int fd,
@@ skipping 20 matching lines @@
 
   // Tell the pump to watch the pipe.
   pump->WatchFileDescriptor(pipefds_[0], false, MessagePumpLibevent::WATCH_READ,
                             &controller, &delegate);
 
   // Make the IO thread wait for |event| before writing to pipefds[1].
   const char buf = 0;
   const WaitableEventWatcher::EventCallback write_fd_task =
       Bind(&WriteFDWrapper, pipefds_[1], &buf, 1);
   io_loop()->task_runner()->PostTask(
-      FROM_HERE, Bind(IgnoreResult(&WaitableEventWatcher::StartWatching),
-                      Unretained(watcher.get()), &event, write_fd_task));
+      FROM_HERE, BindOnce(IgnoreResult(&WaitableEventWatcher::StartWatching),
+                          Unretained(watcher.get()), &event, write_fd_task));
 
   // Queue |event| to signal on |loop|.
   loop.task_runner()->PostTask(
-      FROM_HERE, Bind(&WaitableEvent::Signal, Unretained(&event)));
+      FROM_HERE, BindOnce(&WaitableEvent::Signal, Unretained(&event)));
 
   // Now run the MessageLoop.
   run_loop.Run();
 
   // StartWatching can move |watcher| to IO thread. Release on IO thread.
   io_loop()->task_runner()->PostTask(
       FROM_HERE,
-      Bind(&WaitableEventWatcher::StopWatching, Owned(watcher.release())));
+      BindOnce(&WaitableEventWatcher::StopWatching, Owned(watcher.release())));
 }
 
 }  // namespace
 
 }  // namespace base