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

base/memory/weak_ptr_unittest.cc

Index: base/memory/weak_ptr_unittest.cc
diff --git a/base/memory/weak_ptr_unittest.cc b/base/memory/weak_ptr_unittest.cc
index 1a4870eab184e39f80fa2dd3d2b7abb797d61ab3..d223bd2bf6d801379f5aa85372cf7be7d3ae50bc 100644
--- a/base/memory/weak_ptr_unittest.cc
+++ b/base/memory/weak_ptr_unittest.cc
@@ -32,7 +32,8 @@ class OffThreadObjectCreator {
       Thread creator_thread("creator_thread");
       creator_thread.Start();
       creator_thread.task_runner()->PostTask(
-          FROM_HERE, base::Bind(OffThreadObjectCreator::CreateObject, &result));
+          FROM_HERE,
+          base::BindOnce(OffThreadObjectCreator::CreateObject, &result));
     }
     DCHECK(result);  // We synchronized on thread destruction above.
     return result;
@@ -73,8 +74,8 @@ class BackgroundThread : public Thread {
     WaitableEvent completion(WaitableEvent::ResetPolicy::MANUAL,
                              WaitableEvent::InitialState::NOT_SIGNALED);
     task_runner()->PostTask(
-        FROM_HERE, base::Bind(&BackgroundThread::DoCreateArrowFromTarget, arrow,
-                              target, &completion));
+        FROM_HERE, base::BindOnce(&BackgroundThread::DoCreateArrowFromTarget,
+                                  arrow, target, &completion));
     completion.Wait();
   }
 
@@ -82,8 +83,8 @@ class BackgroundThread : public Thread {
     WaitableEvent completion(WaitableEvent::ResetPolicy::MANUAL,
                              WaitableEvent::InitialState::NOT_SIGNALED);
     task_runner()->PostTask(
-        FROM_HERE, base::Bind(&BackgroundThread::DoCreateArrowFromArrow, arrow,
-                              other, &completion));
+        FROM_HERE, base::BindOnce(&BackgroundThread::DoCreateArrowFromArrow,
+                                  arrow, other, &completion));
     completion.Wait();
   }
 
@@ -92,7 +93,7 @@ class BackgroundThread : public Thread {
                              WaitableEvent::InitialState::NOT_SIGNALED);
     task_runner()->PostTask(
         FROM_HERE,
-        base::Bind(&BackgroundThread::DoDeleteTarget, object, &completion));
+        base::BindOnce(&BackgroundThread::DoDeleteTarget, object, &completion));
     completion.Wait();
   }
 
@@ -100,8 +101,8 @@ class BackgroundThread : public Thread {
     WaitableEvent completion(WaitableEvent::ResetPolicy::MANUAL,
                              WaitableEvent::InitialState::NOT_SIGNALED);
     task_runner()->PostTask(
-        FROM_HERE, base::Bind(&BackgroundThread::DoCopyAndAssignArrow, object,
-                              &completion));
+        FROM_HERE, base::BindOnce(&BackgroundThread::DoCopyAndAssignArrow,
+                                  object, &completion));
     completion.Wait();
   }
 
@@ -109,8 +110,8 @@ class BackgroundThread : public Thread {
     WaitableEvent completion(WaitableEvent::ResetPolicy::MANUAL,
                              WaitableEvent::InitialState::NOT_SIGNALED);
     task_runner()->PostTask(
-        FROM_HERE, base::Bind(&BackgroundThread::DoCopyAndAssignArrowBase,
-                              object, &completion));
+        FROM_HERE, base::BindOnce(&BackgroundThread::DoCopyAndAssignArrowBase,
+                                  object, &completion));
     completion.Wait();
   }
 
@@ -119,7 +120,7 @@ class BackgroundThread : public Thread {
                              WaitableEvent::InitialState::NOT_SIGNALED);
     task_runner()->PostTask(
         FROM_HERE,
-        base::Bind(&BackgroundThread::DoDeleteArrow, object, &completion));
+        base::BindOnce(&BackgroundThread::DoDeleteArrow, object, &completion));
     completion.Wait();
   }
 
@@ -127,8 +128,9 @@ class BackgroundThread : public Thread {
     WaitableEvent completion(WaitableEvent::ResetPolicy::MANUAL,
                              WaitableEvent::InitialState::NOT_SIGNALED);
     Target* result = nullptr;
-    task_runner()->PostTask(FROM_HERE, base::Bind(&BackgroundThread::DoDeRef,
-                                                  arrow, &result, &completion));
+    task_runner()->PostTask(
+        FROM_HERE, base::BindOnce(&BackgroundThread::DoDeRef, arrow, &result,
+                                  &completion));
     completion.Wait();
     return result;
   }