Remove accessor properties not used by Fasta.

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

Index: pkg/front_end/lib/src/fasta/kernel/fasta_accessors.dart
diff --git a/pkg/front_end/lib/src/fasta/kernel/fasta_accessors.dart b/pkg/front_end/lib/src/fasta/kernel/fasta_accessors.dart
index a153127b331f9294455892a37f793bc7afccd9ac..2f369e52dd9314ebef91bc701d0959309095fa1d 100644
--- a/pkg/front_end/lib/src/fasta/kernel/fasta_accessors.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/fasta_accessors.dart
@@ -157,22 +157,6 @@ abstract class FastaAccessor implements Accessor {
 }
 
 abstract class ErrorAccessor implements FastaAccessor {
-  @override
-  Expression get builtBinary => internalError("Unsupported operation.");
-
-  @override
-  void set builtBinary(Expression expression) {
-    internalError("Unsupported operation.");
-  }
-
-  @override
-  Expression get builtGetter => internalError("Unsupported operation.");
-
-  @override
-  void set builtGetter(Expression expression) {
-    internalError("Unsupported operation.");
-  }
-
   /// Pass [arguments] that must be evaluated before throwing an error.  At
   /// most one of [isGetter] and [isSetter] should be true and they're passed
   /// to [BuilderHelper.buildThrowNoSuchMethodError] if it is used.
@@ -274,22 +258,6 @@ class ThisAccessor extends FastaAccessor {
   ThisAccessor(this.helper, this.token, this.isInitializer,
       {this.isSuper: false});
 
-  @override
-  Expression get builtBinary => internalError("Unsupported operation.");
-
-  @override
-  void set builtBinary(Expression expression) {
-    internalError("Unsupported operation.");
-  }
-
-  @override
-  Expression get builtGetter => internalError("Unsupported operation.");
-
-  @override
-  void set builtGetter(Expression expression) {
-    internalError("Unsupported operation.");
-  }
-
   String get plainNameForRead => internalError(isSuper ? "super" : "this");
 
   Expression buildSimpleRead() {
@@ -413,22 +381,6 @@ abstract class IncompleteSend extends FastaAccessor {
 
   IncompleteSend(this.helper, this.token, this.name);
 
-  @override
-  Expression get builtBinary => internalError("Unsupported operation.");
-
-  @override
-  void set builtBinary(Expression expression) {
-    internalError("Unsupported operation.");
-  }
-
-  @override
-  Expression get builtGetter => internalError("Unsupported operation.");
-
-  @override
-  void set builtGetter(Expression expression) {
-    internalError("Unsupported operation.");
-  }
-
   withReceiver(Object receiver, {bool isNullAware});
 }