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

base/deferred_sequenced_task_runner_unittest.cc

 // Copyright (c) 2013 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/deferred_sequenced_task_runner.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/location.h"
 #include "base/memory/ref_counted.h"
@@ skipping 26 matching lines @@
     DeferredSequencedTaskRunnerTest* executor_;
     int task_id_;
   };
 
   void ExecuteTask(int task_id) {
     base::AutoLock lock(lock_);
     executed_task_ids_.push_back(task_id);
   }
 
   void PostExecuteTask(int task_id) {
-    runner_->PostTask(FROM_HERE,
-                      base::Bind(&DeferredSequencedTaskRunnerTest::ExecuteTask,
-                                 base::Unretained(this),
-                                 task_id));
+    runner_->PostTask(
+        FROM_HERE, base::BindOnce(&DeferredSequencedTaskRunnerTest::ExecuteTask,
+                                  base::Unretained(this), task_id));
   }
 
   void StartRunner() {
     runner_->Start();
   }
 
   void DoNothing(ExecuteTaskOnDestructor* object) {
   }
 
  protected:
@@ skipping 58 matching lines @@
 
 TEST_F(DeferredSequencedTaskRunnerTest, DeferredStartWithMultipleThreads) {
   {
     base::Thread thread1("DeferredSequencedTaskRunnerTestThread1");
     base::Thread thread2("DeferredSequencedTaskRunnerTestThread2");
     thread1.Start();
     thread2.Start();
     for (int i = 0; i < 5; ++i) {
       thread1.task_runner()->PostTask(
           FROM_HERE,
-          base::Bind(&DeferredSequencedTaskRunnerTest::PostExecuteTask,
-                     base::Unretained(this), 2 * i));
+          base::BindOnce(&DeferredSequencedTaskRunnerTest::PostExecuteTask,
+                         base::Unretained(this), 2 * i));
       thread2.task_runner()->PostTask(
           FROM_HERE,
-          base::Bind(&DeferredSequencedTaskRunnerTest::PostExecuteTask,
-                     base::Unretained(this), 2 * i + 1));
+          base::BindOnce(&DeferredSequencedTaskRunnerTest::PostExecuteTask,
+                         base::Unretained(this), 2 * i + 1));
       if (i == 2) {
         thread1.task_runner()->PostTask(
-            FROM_HERE, base::Bind(&DeferredSequencedTaskRunnerTest::StartRunner,
-                                  base::Unretained(this)));
+            FROM_HERE,
+            base::BindOnce(&DeferredSequencedTaskRunnerTest::StartRunner,
+                           base::Unretained(this)));
       }
     }
   }
 
   base::RunLoop().RunUntilIdle();
   EXPECT_THAT(executed_task_ids_,
       testing::WhenSorted(testing::ElementsAre(0, 1, 2, 3, 4, 5, 6, 7, 8, 9)));
 }
 
 TEST_F(DeferredSequencedTaskRunnerTest, ObjectDestructionOrder) {
   {
     base::Thread thread("DeferredSequencedTaskRunnerTestThread");
     thread.Start();
     runner_ = new base::DeferredSequencedTaskRunner(thread.task_runner());
     for (int i = 0; i < 5; ++i) {
       {
         // Use a block to ensure that no reference to |short_lived_object|
         // is kept on the main thread after it is posted to |runner_|.
         scoped_refptr<ExecuteTaskOnDestructor> short_lived_object =
             new ExecuteTaskOnDestructor(this, 2 * i);
         runner_->PostTask(
-            FROM_HERE, base::Bind(&DeferredSequencedTaskRunnerTest::DoNothing,
-                                  base::Unretained(this),
-                                  base::RetainedRef(short_lived_object)));
+            FROM_HERE,
+            base::BindOnce(&DeferredSequencedTaskRunnerTest::DoNothing,
+                           base::Unretained(this),
+                           base::RetainedRef(short_lived_object)));
       }
       // |short_lived_object| with id |2 * i| should be destroyed before the
       // task |2 * i + 1| is executed.
       PostExecuteTask(2 * i + 1);
     }
     StartRunner();
   }
 
   // All |short_lived_object| with id |2 * i| are destroyed before the task
   // |2 * i + 1| is executed.
   EXPECT_THAT(executed_task_ids_,
               testing::ElementsAre(0, 1, 2, 3, 4, 5, 6, 7, 8, 9));
 }
 
 }  // namespace