Renamed some scoping classes to make their usage clearer.

pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart

Index: pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
diff --git a/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart b/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
index 569a6a2deef5c1d67897bf9b0cfdc3542add6d71..ed9fc51ecdbe83c36043c7ad7e9abba4c64cfe23 100644
--- a/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
+++ b/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
@@ -360,9 +360,9 @@ class KernelAstAdapter extends KernelToElementMapBaseMixin
   }
 
   @override
-  LoopClosureScope getLoopClosureScope(
+  CapturedLoopScope getCapturedLoopScope(
       ClosureDataLookup closureLookup, ir.TreeNode node) {
-    return closureLookup.getLoopClosureScope(getNode(node));
+    return closureLookup.getCapturedLoopScope(getNode(node));
   }
 }