[device] Replace MessageLoopProxy usage with ThreadTaskRunnerHandle

device/serial/serial_io_handler_posix.cc

Index: device/serial/serial_io_handler_posix.cc
diff --git a/device/serial/serial_io_handler_posix.cc b/device/serial/serial_io_handler_posix.cc
index 5b3b3351de95665b821a04822674d9760a676bcc..b312e837f40babb8a140dc7de267f6cacdaf5e75 100644
--- a/device/serial/serial_io_handler_posix.cc
+++ b/device/serial/serial_io_handler_posix.cc
@@ -129,16 +129,16 @@ namespace device {
 
 // static
 scoped_refptr<SerialIoHandler> SerialIoHandler::Create(
-    scoped_refptr<base::MessageLoopProxy> file_thread_message_loop,
-    scoped_refptr<base::MessageLoopProxy> ui_thread_message_loop) {
+    scoped_refptr<base::SingleThreadTaskRunner> file_thread_message_loop,
+    scoped_refptr<base::SingleThreadTaskRunner> ui_thread_message_loop) {
   return new SerialIoHandlerPosix(file_thread_message_loop,
                                   ui_thread_message_loop);
 }
 
 void SerialIoHandlerPosix::RequestAccess(
     const std::string& port,
-    scoped_refptr<base::MessageLoopProxy> file_message_loop,
-    scoped_refptr<base::MessageLoopProxy> ui_message_loop) {
+    scoped_refptr<base::SingleThreadTaskRunner> file_message_loop,
+    scoped_refptr<base::SingleThreadTaskRunner> ui_message_loop) {
 #if defined(OS_LINUX) && defined(OS_CHROMEOS)
   if (base::SysInfo::IsRunningOnChromeOS()) {
     chromeos::PermissionBrokerClient* client =
@@ -279,8 +279,8 @@ bool SerialIoHandlerPosix::ConfigurePortImpl() {
 }
 
 SerialIoHandlerPosix::SerialIoHandlerPosix(
-    scoped_refptr<base::MessageLoopProxy> file_thread_message_loop,
-    scoped_refptr<base::MessageLoopProxy> ui_thread_message_loop)
+    scoped_refptr<base::SingleThreadTaskRunner> file_thread_message_loop,
+    scoped_refptr<base::SingleThreadTaskRunner> ui_thread_message_loop)
     : SerialIoHandler(file_thread_message_loop, ui_thread_message_loop),
       is_watching_reads_(false),
       is_watching_writes_(false) {