Remove AstFactory.field()

pkg/front_end/lib/src/fasta/kernel/kernel_ast_factory.dart

Index: pkg/front_end/lib/src/fasta/kernel/kernel_ast_factory.dart
diff --git a/pkg/front_end/lib/src/fasta/kernel/kernel_ast_factory.dart b/pkg/front_end/lib/src/fasta/kernel/kernel_ast_factory.dart
index e1b97fd8a72a5716e468126e66f20ff3f6373e8a..555f799eff019772132cafdcf6d1bd7eb2cc41a9 100644
--- a/pkg/front_end/lib/src/fasta/kernel/kernel_ast_factory.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/kernel_ast_factory.dart
@@ -23,11 +23,6 @@ class KernelAstFactory implements AstFactory<VariableDeclaration> {
   }
 
   @override
-  Field field(Name name, int charOffset, {String fileUri}) {
-    return new KernelField(name, fileUri: fileUri)..fileOffset = charOffset;
-  }
-
-  @override
   FunctionExpression functionExpression(FunctionNode function, Token token) {
     return new KernelFunctionExpression(function)
       ..fileOffset = offsetForToken(token);