Clean up leg.dart.

dart/lib/compiler/implementation/ssa/tracer.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('tracer');
+library tracer;
 
-#import('dart:io');
-#import('ssa.dart');
-#import('../js_backend/js_backend.dart');
-#import('../leg.dart');
+import 'dart:io';
+import 'ssa.dart';
+import '../js_backend/js_backend.dart';
+import '../dart2jslib.dart';
 
 const bool GENERATE_SSA_TRACE = false;
 const String SSA_TRACE_FILTER = null;
 
 class HTracer extends HGraphVisitor implements Tracer {
   JavaScriptItemCompilationContext context;
   int indent = 0;
   final RandomAccessFile output;
   final bool enabled = GENERATE_SSA_TRACE;
   bool traceActive = false;
@@ skipping 503 matching lines @@
   }
 
   String visitTypeConversion(HTypeConversion node) {
     return "TypeConversion: ${temporaryId(node.checkedInput)} to ${node.type}";
   }
 
   String visitRangeConversion(HRangeConversion node) {
     return "RangeConversion: ${node.checkedInput}";
   }
 }