Split implementation of KernelToElementMapImpl

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

Index: pkg/compiler/lib/src/kernel/types.dart
diff --git a/pkg/compiler/lib/src/kernel/types.dart b/pkg/compiler/lib/src/kernel/types.dart
index 5bf122e2d1f202614764cc6d06f33243dbed8b4d..14fd6049fd9b389729f0499365cea5b57d17bfb8 100644
--- a/pkg/compiler/lib/src/kernel/types.dart
+++ b/pkg/compiler/lib/src/kernel/types.dart
@@ -6,7 +6,7 @@ part of dart2js.kernel.element_map;
 
 /// Support for subtype checks of kernel based [DartType]s.
 class _KernelDartTypes extends DartTypes {
-  final KernelToElementMapImpl elementMap;
+  final KernelToElementMapBase elementMap;
   final SubtypeVisitor<DartType> subtypeVisitor;
   final PotentialSubtypeVisitor<DartType> potentialSubtypeVisitor;
 
@@ -79,7 +79,7 @@ class _KernelDartTypes extends DartTypes {
 }
 
 class _KernelOrderedTypeSetBuilder extends OrderedTypeSetBuilderBase {
-  final KernelToElementMapImpl elementMap;
+  final KernelToElementMapBase elementMap;
 
   _KernelOrderedTypeSetBuilder(this.elementMap, ClassEntity cls)
       : super(cls,
@@ -105,7 +105,7 @@ class _KernelOrderedTypeSetBuilder extends OrderedTypeSetBuilderBase {
 
 abstract class _AbstractTypeRelationMixin
     implements AbstractTypeRelation<DartType> {
-  KernelToElementMapImpl get elementMap;
+  KernelToElementMapBase get elementMap;
 
   @override
   CommonElements get commonElements => elementMap.commonElements;
@@ -130,14 +130,14 @@ abstract class _AbstractTypeRelationMixin
 
 class _KernelSubtypeVisitor extends SubtypeVisitor<DartType>
     with _AbstractTypeRelationMixin {
-  final KernelToElementMapImpl elementMap;
+  final KernelToElementMapBase elementMap;
 
   _KernelSubtypeVisitor(this.elementMap);
 }
 
 class _KernelPotentialSubtypeVisitor extends PotentialSubtypeVisitor<DartType>
     with _AbstractTypeRelationMixin {
-  final KernelToElementMapImpl elementMap;
+  final KernelToElementMapBase elementMap;
 
   _KernelPotentialSubtypeVisitor(this.elementMap);
 }