WebUI Tab Strip: Fix typo in alert indicator for serial port

Change-Id: Ie57da6d81d9ea386b47333483438b4356f02158b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1889113
Auto-Submit: John Lee <johntlee@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710637}

chrome/browser/resources/tab_strip/alert_indicator.js

@@ -36,7 +36,7 @@ function getAriaLabel(alertState) {
     case TabAlertState.USB_CONNECTED:
       return loadTimeData.getStringF('usbConnected', '');
     case TabAlertState.SERIAL_CONNECTED:
-      return loadTimeData.getStringF('seriaLConnected', '');
+      return loadTimeData.getStringF('serialConnected', '');
     case TabAlertState.PIP_PLAYING:
       return loadTimeData.getStringF('pipPlaying', '');
     case TabAlertState.DESKTOP_CAPTURING: