In Chrome OS, you cannot reinstall individual drivers. You must either update the OS or perform a full recovery. The Wi-Fi driver is part of the kernel module iwlwifi for Intel cards or ath10k_pci for Qualcomm.
If a component on your laptop (like the camera or sound) is acting up, a missing driver is rarely the cause. Instead, the laptop likely needs a standard system update. To pull the latest software and hardware patches: Click the in the bottom-right corner of your screen. Select the Settings gear icon. On the left panel, click About ChromeOS . Click the Check for updates button. dell chromebook 11 3180 drivers