pkg/compiler: clean up imports

pkg/compiler/lib/src/resolution/send_resolver.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library dart2js.semantics_visitor.resolver;
 
 import '../common.dart';
 import '../constants/expressions.dart';
 import '../dart_types.dart';
 import '../elements/elements.dart';
 import '../tree/tree.dart';
-
 import 'semantic_visitor.dart';
 import 'send_structure.dart';
 import 'tree_elements.dart';
 
 abstract class DeclStructure<R, A> {
   final FunctionElement element;
 
   DeclStructure(this.element);
 
   /// Calls the matching visit method on [visitor] with [node] and [arg].
@@ skipping 306 matching lines @@
       return internalError(node, "Unexpected variable $element.");
     }
     if (element.isConst) {
       ConstantExpression constant = elements.getConstant(element.initializer);
       return new ConstantVariableStructure(kind, node, element, constant);
     } else {
       return new NonConstantVariableStructure(kind, node, element);
     }
   }
 }