Revert "Various redemptions"

pkg/compiler/lib/src/kernel/element_map_impl.dart

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library dart2js.kernel.element_map;
 
 import 'package:kernel/ast.dart' as ir;
 
 import '../closure.dart' show BoxLocal;
 import '../common.dart';
@@ skipping 601 matching lines @@
     _ensureThisAndRawType(cls, data);
     return data.rawType;
   }
 
   FunctionType _getFunctionType(IndexedFunction function) {
     assert(checkFamily(function));
     FunctionData data = _memberData[function.memberIndex];
     return data.getFunctionType(this);
   }
 
-  DartType _getFieldType(IndexedField field) {
-    assert(checkFamily(field));
-    FieldData data = _memberData[field.memberIndex];
-    return data.getFieldType(this);
-  }
-
   ClassEntity _getAppliedMixin(IndexedClass cls) {
     assert(checkFamily(cls));
     ClassData data = _classData[cls.classIndex];
     _ensureSupertypes(cls, data);
     return data.mixedInType?.element;
   }
 
   bool _isMixinApplication(IndexedClass cls) {
     assert(checkFamily(cls));
     ClassData data = _classData[cls.classIndex];
@@ skipping 698 matching lines @@
       ClassEntity cls, List<DartType> typeArguments) {
     return new InterfaceType(cls, typeArguments);
   }
 
   @override
   FunctionType getFunctionType(FunctionEntity function) {
     return elementMap._getFunctionType(function);
   }
 
   @override
-  DartType getFieldType(FieldEntity field) {
-    return elementMap._getFieldType(field);
-  }
-
-  @override
   FunctionType getLocalFunctionType(covariant KLocalFunction function) {
     return function.functionType;
   }
 
   @override
   DartType getUnaliasedType(DartType type) => type;
 
   @override
   ConstructorEntity lookupConstructor(ClassEntity cls, String name,
       {bool required: false}) {
@@ skipping 960 matching lines @@
   ///
   /// These names are not used in generated code, just as element name.
   String _getClosureVariableName(String name, int id) {
     return "_captured_${name}_$id";
   }
 
   String getDeferredUri(ir.LibraryDependency node) {
     throw new UnimplementedError('JsKernelToElementMap.getDeferredUri');
   }
 }