Renamed some scoping classes to make their usage clearer.

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

Index: pkg/compiler/lib/src/kernel/element_map.dart
diff --git a/pkg/compiler/lib/src/kernel/element_map.dart b/pkg/compiler/lib/src/kernel/element_map.dart
index 8e7320a91af00c977246b1cb71daf50696d15502..b075338ab0e1fe923f1f17f29c15bbce77e5cf04 100644
--- a/pkg/compiler/lib/src/kernel/element_map.dart
+++ b/pkg/compiler/lib/src/kernel/element_map.dart
@@ -315,8 +315,9 @@ abstract class KernelToLocalsMap {
   /// if [node] is not a jump target.
   JumpTarget getJumpTargetForWhile(ir.WhileStatement node);
 
-  /// Returns the [LoopClosureScope] for the loop [node] in [closureClassMaps].
-  LoopClosureScope getLoopClosureScope(
+  /// Returns the [LoopScopeInClosure] for the loop [node] in
+  /// [closureClassMaps].
+  LoopScopeInClosure getLoopScopeInClosure(
       ClosureDataLookup closureLookup, ir.TreeNode node);
 }