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

base/process/process_metrics_unittest.cc

 // Copyright 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/process/process_metrics.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <sstream>
@@ skipping 359 matching lines @@
   thread3.StartAndWaitForTesting();
 
   ASSERT_TRUE(thread1.IsRunning());
   ASSERT_TRUE(thread2.IsRunning());
   ASSERT_TRUE(thread3.IsRunning());
 
   std::vector<std::string> vec1;
   std::vector<std::string> vec2;
   std::vector<std::string> vec3;
 
-  thread1.task_runner()->PostTask(FROM_HERE, Bind(&BusyWork, &vec1));
-  thread2.task_runner()->PostTask(FROM_HERE, Bind(&BusyWork, &vec2));
-  thread3.task_runner()->PostTask(FROM_HERE, Bind(&BusyWork, &vec3));
+  thread1.task_runner()->PostTask(FROM_HERE, BindOnce(&BusyWork, &vec1));
+  thread2.task_runner()->PostTask(FROM_HERE, BindOnce(&BusyWork, &vec2));
+  thread3.task_runner()->PostTask(FROM_HERE, BindOnce(&BusyWork, &vec3));
 
   EXPECT_GE(metrics->GetCPUUsage(), 0.0);
 
   thread1.Stop();
   EXPECT_GE(metrics->GetCPUUsage(), 0.0);
 
   thread2.Stop();
   EXPECT_GE(metrics->GetCPUUsage(), 0.0);
 
   thread3.Stop();
@@ skipping 169 matching lines @@
 
   std::unique_ptr<ProcessMetrics> metrics(
       ProcessMetrics::CreateProcessMetrics(spawn_child.process.Handle()));
   EXPECT_EQ(0, metrics->GetOpenFdCount());
   ASSERT_TRUE(spawn_child.process.Terminate(0, true));
 }
 #endif  // defined(OS_LINUX)
 
 }  // namespace debug
 }  // namespace base