Create new interface instead of ClosureClassMap for variable usage information that is not Element-…

pkg/compiler/lib/src/inferrer/builder.dart

Index: pkg/compiler/lib/src/inferrer/builder.dart
diff --git a/pkg/compiler/lib/src/inferrer/builder.dart b/pkg/compiler/lib/src/inferrer/builder.dart
index b258a6e7962691b303b129c9138a78a1049cdd72..dbca60b3f828f6ba6918efd1456d7fbcc49193fa 100644
--- a/pkg/compiler/lib/src/inferrer/builder.dart
+++ b/pkg/compiler/lib/src/inferrer/builder.dart
@@ -4,7 +4,7 @@
 
 library simple_types_inferrer;
 
-import '../closure.dart' show ClosureClassMap;
+import '../closure.dart' show ClosureRepresentationInfo;
 import '../common.dart';
 import '../common/names.dart' show Identifiers, Selectors;
 import '../compiler.dart' show Compiler;
@@ -914,7 +914,8 @@ class ElementGraphBuilder extends ast.Visitor<TypeInformation>
     // be handled specially, in that we are computing their LUB at
     // each update, and reading them yields the type that was found in a
     // previous analysis of [outermostElement].
-    ClosureClassMap closureData =
+    // TODO(efortuna): elminiate getClosureToClassMapping
+    ClosureRepresentationInfo closureData =
         compiler.closureToClassMapper.getClosureToClassMapping(analyzedElement);
     closureData.forEachCapturedVariable((variable, field) {
       locals.setCaptured(variable, field);
@@ -1098,7 +1099,8 @@ class ElementGraphBuilder extends ast.Visitor<TypeInformation>
     // Record the types of captured non-boxed variables. Types of
     // these variables may already be there, because of an analysis of
     // a previous closure.
-    ClosureClassMap nestedClosureData =
+    // TODO (efortuna): eliminate.
+    ClosureRepresentationInfo nestedClosureData =
         compiler.closureToClassMapper.getClosureToClassMapping(element);
     nestedClosureData.forEachCapturedVariable((variable, field) {
       if (!nestedClosureData.isVariableBoxed(variable)) {