Clean up leg.dart.

dart/lib/compiler/implementation/leg.dart

-// Copyright (c) 2012, 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('leg');
-
-#import('dart:uri');
-
-#import('closure.dart', prefix: 'closureMapping');
-#import('dart_backend/dart_backend.dart', prefix: 'dart_backend');
-#import('elements/elements.dart');
-#import('js_backend/js_backend.dart', prefix: 'js_backend');
-#import('native_handler.dart', prefix: 'native');
-#import('scanner/scanner_implementation.dart');
-#import('scanner/scannerlib.dart');
-#import('ssa/ssa.dart');
-#import('string_validator.dart');
-#import('source_file.dart');
-#import('tree/tree.dart');
-#import('universe/universe.dart');
-#import('util/characters.dart');
-#import('util/util.dart');
-#import('../compiler.dart', prefix: 'api');
-#import('patch_parser.dart');
-#import('types/types.dart', prefix: 'ti');
-
-#source('code_buffer.dart');
-#source('compile_time_constants.dart');
-#source('compiler.dart');
-#source('constants.dart');
-#source('constant_system.dart');
-#source('constant_system_dart.dart');
-#source('diagnostic_listener.dart');
-#source('enqueue.dart');
-#source('library_loader.dart');
-#source('resolved_visitor.dart');
-#source('resolver.dart');
-#source('script.dart');
-#source('tree_validator.dart');
-#source('typechecker.dart');
-#source('warnings.dart');
-#source('world.dart');