For #18553 Revert "For #17804: Use enterToImmersiveMode from support-ktx component"

This reverts commit fbe73cfc

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

@@ -110,6 +110,7 @@ import org.mozilla.fenix.downloads.DynamicDownloadDialog
 import org.mozilla.fenix.ext.accessibilityManager
 import org.mozilla.fenix.ext.breadcrumb
 import org.mozilla.fenix.ext.components
+import org.mozilla.fenix.ext.enterToImmersiveMode
 import org.mozilla.fenix.ext.getPreferenceKey
 import org.mozilla.fenix.ext.hideToolbar
 import org.mozilla.fenix.ext.metrics
@@ -128,7 +129,6 @@ import java.lang.ref.WeakReference
 import mozilla.components.feature.session.behavior.EngineViewBrowserToolbarBehavior
 import mozilla.components.feature.webauthn.WebAuthnFeature
 import mozilla.components.support.base.feature.ActivityResultHandler
-import mozilla.components.support.ktx.android.view.enterToImmersiveMode
 import org.mozilla.fenix.GleanMetrics.PerfStartup
 import org.mozilla.fenix.ext.measureNoInline
 import mozilla.components.feature.session.behavior.ToolbarPosition as MozacToolbarPosition

app/src/main/java/org/mozilla/fenix/ext/Activity.kt

@@ -15,13 +15,6 @@ import mozilla.components.concept.base.crash.Breadcrumb
  * We don't use the equivalent function from Android Components because the stable flag messes
  * with the toolbar. See #1998 and #3272.
  */
-@Deprecated(
-    message = "Use the Android Component implementation instead.",
-    replaceWith = ReplaceWith(
-        "enterToImmersiveMode()",
-        "mozilla.components.support.ktx.android.view.enterToImmersiveMode"
-    )
-)
 fun Activity.enterToImmersiveMode() {
     window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
     window.decorView.systemUiVisibility = (View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION