For #15121 - Ensure tabs removed while on browser select an available parent session

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

@@ -940,7 +940,12 @@ abstract class BaseBrowserFragment : Fragment(), UserInteractionHandler, Session
                 true
             } else {
                 if (session.hasParentSession) {
-                    requireComponents.useCases.tabsUseCases.removeTab(session)
+                    // The removeTab use case does not currently select a parent session, so
+                    // we are using sessionManager.remove
+                    requireComponents.core.sessionManager.remove(
+                        session,
+                        selectParentIfExists = true
+                    )
                 }
                 // We want to return to home if this session didn't have a parent session to select.
                 val goToOverview = !session.hasParentSession

app/src/main/java/org/mozilla/fenix/components/toolbar/BrowserToolbarController.kt

@@ -145,7 +145,9 @@ class DefaultBrowserToolbarController(
                         )
                     } else {
                         onCloseTab.invoke(it)
-                        activity.components.useCases.tabsUseCases.removeTab.invoke(it)
+                        // The removeTab use case does not currently select a parent session, so
+                        // we are using sessionManager.remove
+                        sessionManager.remove(it, selectParentIfExists = true)
                     }
                 }
             }

app/src/test/java/org/mozilla/fenix/components/toolbar/DefaultBrowserToolbarControllerTest.kt

@@ -21,7 +21,6 @@ import mozilla.components.browser.session.SessionManager
 import mozilla.components.concept.engine.EngineView
 import mozilla.components.feature.search.SearchUseCases
 import mozilla.components.feature.session.SessionUseCases
-import mozilla.components.feature.tabs.TabsUseCases
 import mozilla.components.feature.top.sites.TopSitesUseCases
 import org.junit.Assert.assertEquals
 import org.junit.Before
@@ -200,17 +199,13 @@ class DefaultBrowserToolbarControllerTest {
 
     @Test
     fun handleToolbarCloseTabPress() {
-        val tabsUseCases: TabsUseCases = mockk(relaxed = true)
-        val removeTabUseCase: TabsUseCases.RemoveTabUseCase = mockk(relaxed = true)
         val item = TabCounterMenu.Item.CloseTab
 
         every { sessionManager.sessions } returns emptyList()
-        every { activity.components.useCases.tabsUseCases } returns tabsUseCases
-        every { tabsUseCases.removeTab } returns removeTabUseCase
 
         val controller = createController()
         controller.handleTabCounterItemInteraction(item)
-        verify { removeTabUseCase.invoke(currentSession) }
+        verify { sessionManager.remove(currentSession, selectParentIfExists = true) }
     }
 
     @Test