[fenix] For https://github.com/mozilla-mobile/fenix/issues/13329 - Remove tab history feature flag.

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

@@ -812,12 +812,9 @@ abstract class BaseBrowserFragment : Fragment(), UserInteractionHandler, Session
     }
 
     override fun onBackLongPressed(): Boolean {
-        if (FeatureFlags.tabHistory) {
         findNavController().navigate(R.id.action_global_tabHistoryDialogFragment)
         return true
     }
-        return false
-    }
 
     /**
      * Saves the external app session ID to be restored later in [onViewStateRestored].

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

@@ -23,7 +23,6 @@ import mozilla.components.concept.engine.prompt.ShareData
 import mozilla.components.feature.session.SessionFeature
 import mozilla.components.support.base.feature.ViewBoundFeatureWrapper
 import mozilla.components.support.ktx.kotlin.isUrl
-import org.mozilla.fenix.FeatureFlags
 import org.mozilla.fenix.HomeActivity
 import org.mozilla.fenix.NavGraphDirections
 import org.mozilla.fenix.R
@@ -205,21 +204,17 @@ class DefaultBrowserToolbarController(
 
         Do exhaustive when (item) {
             is ToolbarMenu.Item.Back -> {
-                if (FeatureFlags.tabHistory && item.viewHistory) {
+                if (item.viewHistory) {
                     navController.navigate(R.id.action_global_tabHistoryDialogFragment)
-                } else if (!item.viewHistory) {
-                    sessionUseCases.goBack.invoke(currentSession)
                 } else {
-                    // Do nothing if tab history feature flag is off and item.viewHistory is true
+                    sessionUseCases.goBack.invoke(currentSession)
                 }
             }
             is ToolbarMenu.Item.Forward -> {
-                if (FeatureFlags.tabHistory && item.viewHistory) {
+                if (item.viewHistory) {
                     navController.navigate(R.id.action_global_tabHistoryDialogFragment)
-                } else if (!item.viewHistory) {
-                    sessionUseCases.goForward.invoke(currentSession)
                 } else {
-                    // Do nothing if tab history feature flag is off and item.viewHistory is true
+                    sessionUseCases.goForward.invoke(currentSession)
                 }
             }
             is ToolbarMenu.Item.Reload -> {