Renamed some scoping classes to make their usage clearer.

pkg/compiler/lib/src/js_model/locals.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.js_model.locals;
 
 import 'package:kernel/ast.dart' as ir;
 
 import '../closure.dart';
 import '../common.dart';
@@ skipping 114 matching lines @@
   }
 
   @override
   Local getLocal(ir.VariableDeclaration node) {
     return _map.putIfAbsent(node, () {
       return new JLocal(node.name, currentMember);
     });
   }
 
   @override
-  LoopClosureScope getLoopClosureScope(
+  CapturedLoopScope getCapturedLoopScope(
       ClosureDataLookup closureLookup, ir.TreeNode node) {
-    return closureLookup.getLoopClosureScope(node);
+    return closureLookup.getCapturedLoopScope(node);
   }
 }
 
 class JumpVisitor extends ir.Visitor {
   int index = 0;
   final MemberEntity member;
   final Map<ir.TreeNode, JJumpTarget> jumpTargetMap =
       <ir.TreeNode, JJumpTarget>{};
   final Set<ir.BreakStatement> breaksAsContinue = new Set<ir.BreakStatement>();
 
@@ skipping 122 matching lines @@
       sb.write(memberContext.enclosingClass.name);
       sb.write('.');
     }
     sb.write(memberContext.name);
     sb.write('#');
     sb.write(name);
     sb.write(')');
     return sb.toString();
   }
 }