Revert "Fix force close for updating UI after activity destroyed."

This reverts commit 2545f06558.

Reason for revert: DroidMonitor created revert due  to b/374650528.Will be verified through ABTD for standard investigation.

Change-Id: Ifa3f061b7954dc2b5780b768fefb9358c597fdc0

src/com/android/settings/network/telephony/NetworkSelectSettings.java

@@ -368,11 +368,6 @@ public class NetworkSelectSettings extends DashboardFragment {
 
     @VisibleForTesting
     protected void scanResultHandler(NetworkScanRepository.NetworkScanResult results) {
-        if (isFinishingOrDestroyed()) {
-            Log.d(TAG, "scanResultHandler: activity isFinishingOrDestroyed, directly return");
-            return;
-        }
-
         mCellInfoList = filterOutSatellitePlmn(results.getCellInfos());
         Log.d(TAG, "CellInfoList: " + CellInfoUtil.cellInfoListToString(mCellInfoList));
         updateAllPreferenceCategory();