For #11613: Expand toolbar onUrlChanged

app/src/main/java/org/mozilla/fenix/browser/BaseBrowserFragment.kt

@@ -527,14 +527,7 @@ abstract class BaseBrowserFragment : Fragment(), UserInteractionHandler, Session
             )
 
             session.register(observer = object : Session.Observer {
-                override fun onNavigationStateChanged(
-                    session: Session,
-                    canGoBack: Boolean,
-                    canGoForward: Boolean
-                ) {
-                    // Once https://bugzilla.mozilla.org/show_bug.cgi?id=1626338 is fixed, we can
-                    // rely solely on `onLoadRequest` entirely, but as it stands that is not called
-                    // for history navigation (back or forward).
+                override fun onUrlChanged(session: Session, url: String) {
                     browserToolbarView.expand()
                 }