cros: Replace BrowserThread::FILE in InputServiceProxy

chrome/browser/chromeos/login/bluetooth_host_pairing_browsertest.cc

Index: chrome/browser/chromeos/login/bluetooth_host_pairing_browsertest.cc
diff --git a/chrome/browser/chromeos/login/bluetooth_host_pairing_browsertest.cc b/chrome/browser/chromeos/login/bluetooth_host_pairing_browsertest.cc
index f86c942311dd625619be3cdb9ba3aab3e14ae292..394fabcb4919ebedfba04196e5fe2938fa5fa3e8 100644
--- a/chrome/browser/chromeos/login/bluetooth_host_pairing_browsertest.cc
+++ b/chrome/browser/chromeos/login/bluetooth_host_pairing_browsertest.cc
@@ -67,7 +67,11 @@ class BluetoothHostPairingNoInputTest : public OobeBaseTest {
   using InputDeviceInfo = device::InputServiceLinux::InputDeviceInfo;
 
   BluetoothHostPairingNoInputTest() {
-    InputServiceProxy::SetThreadIdForTesting(content::BrowserThread::UI);
+    task_runner_factory_ = base::Bind([]() -> scoped_refptr<base::TaskRunner> {
+      return content::BrowserThread::GetTaskRunnerForThread(
+          content::BrowserThread::UI);
+    });
+    InputServiceProxy::SetTaskRunnerFactoryForTesting(&task_runner_factory_);
     device::InputServiceLinux::SetForTesting(
         base::MakeUnique<device::FakeInputServiceLinux>());
 
@@ -162,6 +166,7 @@ class BluetoothHostPairingNoInputTest : public OobeBaseTest {
 
   bluez::FakeBluetoothDeviceClient* fake_bluetooth_device_client_ = nullptr;
   base::MessageLoop message_loop_;
+  InputServiceProxy::TaskRunnerFactory task_runner_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BluetoothHostPairingNoInputTest);
 };