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

base/synchronization/atomic_flag_unittest.cc

Index: base/synchronization/atomic_flag_unittest.cc
diff --git a/base/synchronization/atomic_flag_unittest.cc b/base/synchronization/atomic_flag_unittest.cc
index a3aa3341a0d1ef500a414335e41e97dd7f2470d7..76e5d968f78b91471bf85227e667f46b1aa18d99 100644
--- a/base/synchronization/atomic_flag_unittest.cc
+++ b/base/synchronization/atomic_flag_unittest.cc
@@ -68,10 +68,9 @@ TEST(AtomicFlagTest, ReadFromDifferentThread) {
 
   Thread thread("AtomicFlagTest.ReadFromDifferentThread");
   ASSERT_TRUE(thread.Start());
-  thread.task_runner()->PostTask(
-      FROM_HERE,
-      Bind(&BusyWaitUntilFlagIsSet, &tested_flag, &expected_after_flag,
-           &reset_flag));
+  thread.task_runner()->PostTask(FROM_HERE,
+                                 BindOnce(&BusyWaitUntilFlagIsSet, &tested_flag,
+                                          &expected_after_flag, &reset_flag));
 
   // To verify that IsSet() fetches the flag's value from memory every time it
   // is called (not just the first time that it is called on a thread), sleep
@@ -100,10 +99,9 @@ TEST(AtomicFlagTest, ReadFromDifferentThread) {
   // |thread| is guaranteed to be synchronized past the
   // |UnsafeResetForTesting()| call when the task runs per the implicit
   // synchronization in the post task mechanism.
-  thread.task_runner()->PostTask(
-      FROM_HERE,
-      Bind(&BusyWaitUntilFlagIsSet, &tested_flag, &expected_after_flag,
-           nullptr));
+  thread.task_runner()->PostTask(FROM_HERE,
+                                 BindOnce(&BusyWaitUntilFlagIsSet, &tested_flag,
+                                          &expected_after_flag, nullptr));
 
   PlatformThread::Sleep(TimeDelta::FromMilliseconds(20));
 
@@ -125,7 +123,7 @@ TEST(AtomicFlagTest, SetOnDifferentSequenceDeathTest) {
 
   AtomicFlag flag;
   flag.Set();
-  t.task_runner()->PostTask(FROM_HERE, Bind(&ExpectSetFlagDeath, &flag));
+  t.task_runner()->PostTask(FROM_HERE, BindOnce(&ExpectSetFlagDeath, &flag));
 }
 
 }  // namespace base