dart2js cleanup: remove unused imports and variables

pkg/compiler/lib/src/deferred_load.dart

Index: pkg/compiler/lib/src/deferred_load.dart
diff --git a/pkg/compiler/lib/src/deferred_load.dart b/pkg/compiler/lib/src/deferred_load.dart
index b8164aeec900424a2a57763d956f60fcc5501a4b..5ce0d30dcf40ecb663ce66f090b3fa47d950aecc 100644
--- a/pkg/compiler/lib/src/deferred_load.dart
+++ b/pkg/compiler/lib/src/deferred_load.dart
@@ -4,9 +4,9 @@
 
 library deferred_load;
 
-import 'common.dart';
 import 'common/backend_api.dart' show Backend;
 import 'common/tasks.dart' show CompilerTask;
+import 'common.dart';
 import 'compiler.dart' show Compiler;
 import 'constants/values.dart'
     show
@@ -21,32 +21,21 @@ import 'elements/elements.dart'
         AstElement,
         ClassElement,
         Element,
-        ElementKind,
         Elements,
         ExportElement,
         FunctionElement,
         ImportElement,
         LibraryElement,
-        LocalFunctionElement,
         MetadataAnnotation,
         PrefixElement,
         ResolvedAstKind,
-        ScopeContainerElement,
         TypedefElement;
 import 'js_backend/js_backend.dart' show JavaScriptBackend;
 import 'resolution/resolution.dart' show AnalyzableElementX;
 import 'resolution/tree_elements.dart' show TreeElements;
 import 'tree/tree.dart' as ast;
-import 'tree/tree.dart'
-    show
-        Import,
-        LibraryTag,
-        LibraryDependency,
-        LiteralDartString,
-        LiteralString,
-        NewExpression,
-        Node;
-import 'universe/use.dart' show DynamicUse, StaticUse, TypeUse, TypeUseKind;
+import 'tree/tree.dart' show Import, Node;
+import 'universe/use.dart' show StaticUse, TypeUse, TypeUseKind;
 import 'universe/world_impact.dart'
     show ImpactUseCase, WorldImpact, WorldImpactVisitorImpl;
 import 'util/setlet.dart' show Setlet;