Fix unique_ptr usage warning in bluetooth_task_manager_win.cc.

device/bluetooth/bluetooth_task_manager_win.cc

Index: device/bluetooth/bluetooth_task_manager_win.cc
diff --git a/device/bluetooth/bluetooth_task_manager_win.cc b/device/bluetooth/bluetooth_task_manager_win.cc
index 3ff036515967d154e762fe9c635116ad95f5c8e4..ed2c651bd67580fcb4f113b60572001a689a8aae 100644
--- a/device/bluetooth/bluetooth_task_manager_win.cc
+++ b/device/bluetooth/bluetooth_task_manager_win.cc
@@ -864,8 +864,9 @@ void BluetoothTaskManagerWin::WriteGattCharacteristicValue(
     std::vector<uint8_t> new_value,
     const HResultCallback& callback) {
   ULONG length = (ULONG)(sizeof(ULONG) + new_value.size());
-  std::unique_ptr<BTH_LE_GATT_CHARACTERISTIC_VALUE> win_new_value(
-      (PBTH_LE_GATT_CHARACTERISTIC_VALUE)(new UCHAR[length]));
+  std::vector<UCHAR> data(length);
+  auto* win_new_value =
+      reinterpret_cast<PBTH_LE_GATT_CHARACTERISTIC_VALUE>(&data[0]);
   win_new_value->DataSize = (ULONG)new_value.size();
   for (ULONG i = 0; i < new_value.size(); i++)
     win_new_value->Data[i] = new_value[i];
@@ -873,7 +874,7 @@ void BluetoothTaskManagerWin::WriteGattCharacteristicValue(
   HRESULT hr =
       win::BluetoothLowEnergyWrapper::GetInstance()->WriteCharacteristicValue(
           service_path, (PBTH_LE_GATT_CHARACTERISTIC)(&characteristic),
-          win_new_value.get());
+          win_new_value);
 
   ui_task_runner_->PostTask(FROM_HERE, base::Bind(callback, hr));
 }