Remove KernelAstAdapter.getNativeBehavior

pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart

Index: pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
diff --git a/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart b/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
index e8bbc4b1588ae65eef3fa7d1aa0c0ed25e971540..e195c5c48bba940aa6796f824b7fe4f764f38f69 100644
--- a/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
+++ b/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
@@ -280,10 +280,6 @@ class KernelAstAdapter extends KernelToElementMapMixin
     });
   }
 
-  native.NativeBehavior getNativeBehavior(ir.Node node) {
-    return elements.getNativeData(getNode(node));
-  }
-
   js.Name getNameForJsGetName(ir.Node argument, ConstantValue constant) {
     int index = _extractEnumIndexFromConstantValue(
         constant, _compiler.commonElements.jsGetNameEnum);