Revert "Enable platform views for Flutter Gallery on iOS. (#29632)" (#29754)

examples/flutter_gallery/ios/Runner/Info.plist

diff --git a/examples/flutter_gallery/ios/Runner/Info.plist b/examples/flutter_gallery/ios/Runner/Info.plist
index 32e0de2..998abd1 100644
--- a/examples/flutter_gallery/ios/Runner/Info.plist
+++ b/examples/flutter_gallery/ios/Runner/Info.plist
@@ -41,8 +41,6 @@
 	</array>
 	<key>ITSAppUsesNonExemptEncryption</key>
 	<false/>
-	<key>io.flutter.embedded_views_preview</key>
-	<true/>
 	<key>UIViewControllerBasedStatusBarAppearance</key>
 	<false/>
 </dict>