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

base/process/process_metrics_unittest.cc

Index: base/process/process_metrics_unittest.cc
diff --git a/base/process/process_metrics_unittest.cc b/base/process/process_metrics_unittest.cc
index a5754cf18bef7833ed457d343685f8d67c31ac73..ed980209c4a36d0bfa04749532d55a8428216ce5 100644
--- a/base/process/process_metrics_unittest.cc
+++ b/base/process/process_metrics_unittest.cc
@@ -377,9 +377,9 @@ TEST_F(SystemMetricsTest, TestNoNegativeCpuUsage) {
   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);