Renamed some scoping classes to make their usage clearer.

pkg/compiler/lib/src/js_model/locals.dart

Index: pkg/compiler/lib/src/js_model/locals.dart
diff --git a/pkg/compiler/lib/src/js_model/locals.dart b/pkg/compiler/lib/src/js_model/locals.dart
index a2e16472030d7cac86e9b8592339cee7bc3160ce..75080f717ab7ab2bdbb349feac678faee19fce91 100644
--- a/pkg/compiler/lib/src/js_model/locals.dart
+++ b/pkg/compiler/lib/src/js_model/locals.dart
@@ -132,9 +132,9 @@ class KernelToLocalsMapImpl implements KernelToLocalsMap {
   }
 
   @override
-  LoopClosureScope getLoopClosureScope(
+  CapturedLoopScope getCapturedLoopScope(
       ClosureDataLookup closureLookup, ir.TreeNode node) {
-    return closureLookup.getLoopClosureScope(node);
+    return closureLookup.getCapturedLoopScope(node);
   }
 }