Bug 1666639: Part 3 - Remove unused Parcel import from GVE's TabSession class; r=geckoview-reviewers,agi

Depends on D91764

Differential Revision: https://phabricator.services.mozilla.com/D91765

mobile/android/geckoview_example/src/main/java/org/mozilla/geckoview_example/TabSession.java

@@ -1,6 +1,5 @@
 package org.mozilla.geckoview_example;
 
-import android.os.Parcel;
 import androidx.annotation.AnyThread;
 import androidx.annotation.NonNull;
 import androidx.annotation.UiThread;