NetworkService: quitSafely() on onDestroy()

- When IwlanNetworkService is un-bound, such as when phone app dies,
  the typical sequence is onUnbind() followed by onDestroy() immediately.
- Messages queued by onUnbind() are not processed, which leaves the
  IwlanNetworkService in an unexpected state for the next onBind().
- The change is applied to DataService.java as well for safety.

Bug: 237447534
Test:
Live test by crashing com.android.phone to verify fix to unbind/destroy
behavior.

Change-Id: I25d968867401bd7d285735c83c71e3649467c5db

telephony/java/android/telephony/NetworkService.java

@@ -265,7 +265,7 @@ public abstract class NetworkService extends Service {
     /** @hide */
     @Override
     public void onDestroy() {
-        mHandlerThread.quit();
+        mHandlerThread.quitSafely();
         super.onDestroy();
     }
 

telephony/java/android/telephony/data/DataService.java

@@ -725,7 +725,7 @@ public abstract class DataService extends Service {
 
     @Override
     public void onDestroy() {
-        mHandlerThread.quit();
+        mHandlerThread.quitSafely();
         super.onDestroy();
     }