revert change

Author: chunhtai

examples/api/macos/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme

@@ -48,7 +48,6 @@
       ignoresPersistentStateOnLaunch = "NO"
       debugDocumentVersioning = "YES"
       debugServiceExtension = "internal"
-      enableGPUValidationMode = "1"
       allowLocationSimulation = "YES">
       <BuildableProductRunnable
          runnableDebuggingMode = "0">