Make serial api timeout callbacks to OnceCallback

These callbacks are only called from PostDelayedTask which calls them
once. They're always reset to a new callback before posting a new task.

Bug: 1152268
Change-Id: I5a04f6227d963982ad2f368eb9d9591668e49f35
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2600031Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Commit-Queue: David Bokan <bokan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839120}

extensions/browser/api/serial/serial_connection.cc

@@ -416,7 +416,7 @@ bool SerialConnection::Send(const std::vector<uint8_t>& data,
 
   send_timeout_task_.Cancel();
   if (send_timeout_ > 0) {
-    send_timeout_task_.Reset(base::Bind(&SerialConnection::OnSendTimeout,
+    send_timeout_task_.Reset(base::BindOnce(&SerialConnection::OnSendTimeout,
                                             weak_factory_.GetWeakPtr()));
     base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
         FROM_HERE, send_timeout_task_.callback(),
@@ -527,8 +527,8 @@ void SerialConnection::InitSerialPortForTesting() {
 
 void SerialConnection::SetTimeoutCallback() {
   if (receive_timeout_ > 0) {
-    receive_timeout_task_.Reset(base::Bind(&SerialConnection::OnReceiveTimeout,
-                                           weak_factory_.GetWeakPtr()));
+    receive_timeout_task_.Reset(base::BindOnce(
+        &SerialConnection::OnReceiveTimeout, weak_factory_.GetWeakPtr()));
     base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
         FROM_HERE, receive_timeout_task_.callback(),
         base::TimeDelta::FromMilliseconds(receive_timeout_));

extensions/browser/api/serial/serial_connection.h

@@ -225,11 +225,11 @@ class SerialConnection : public ApiResource,
 
   // Closure which will trigger a receive timeout unless cancelled. Reset on
   // initialization and after every successful Receive().
-  base::CancelableClosure receive_timeout_task_;
+  base::CancelableOnceClosure receive_timeout_task_;
 
   // Write timeout closure. Reset on initialization and after every successful
   // Send().
-  base::CancelableClosure send_timeout_task_;
+  base::CancelableOnceClosure send_timeout_task_;
 
   // Mojo interface remote corresponding with remote asynchronous I/O handler.
   mojo::Remote<device::mojom::SerialPort> serial_port_;