Revert "fix #27256, track type bounds for generic functions"

pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart

Index: pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart
diff --git a/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart b/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart
index b2fd6c586fbbfa009403195d6980172b0e652856..8e8a2cd130b78152f2ee78e6406ea2a16a3590eb 100644
--- a/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart
+++ b/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart
@@ -246,7 +246,9 @@ _checkAndCall(f, ftype, obj, typeArgs, args, name) => JS(
     let formalCount = $ftype.formalCount;
     
     if ($typeArgs == null) {
-      $typeArgs = $ftype.instantiateDefaultBounds();
+      // TODO(jmesserly): this should use instantiate to bounds logic.
+      // See https://github.com/dart-lang/sdk/issues/27256
+      $typeArgs = Array(formalCount).fill($dynamic);
     } else if ($typeArgs.length != formalCount) {
       // TODO(jmesserly): is this the right error?
       $throwStrongModeError(
@@ -254,6 +256,7 @@ _checkAndCall(f, ftype, obj, typeArgs, args, name) => JS(
           $typeName($ftype) + ', got <' + $typeArgs + '> expected ' +
           formalCount + '.');
     }
+    // Instantiate the function type.
     $ftype = $ftype.instantiate($typeArgs);
   } else if ($typeArgs != null) {
     $throwStrongModeError(