Use new try-catch syntax in runtime/, tools/, and utils/.

runtime/bin/file_impl.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.
 
 class _FileInputStream extends _BaseDataInputStream implements InputStream {
   _FileInputStream(String name)
       : _data = const [],
         _position = 0,
         _filePosition = 0 {
     var file = new File(name);
@@ skipping 926 matching lines @@
           "Invalid arguments to writeList for file '$_name'"));
       });
       return completer.future;
     }
     if (closed) return _completeWithClosedException(completer);
 
     List result;
     try {
       result =
           _FileUtils.ensureFastAndSerializableBuffer(buffer, offset, bytes);
-    } catch (var e) {
+    } catch (e) {
       // Complete asynchronously so the user has a chance to setup
       // handlers without getting exceptions when registering the
       // then handler.
       new Timer(0, (t) => completer.completeException(e));
       return completer.future;
     }
     List outBuffer = result[0];
     int outOffset = result[1];
 
     List request = new List(5);
@@ skipping 203 matching lines @@
           new FileIOException("File closed '$_name'"));
     });
     return completer.future;
   }
 
   final String _name;
   int _id;
 
   SendPort _fileService;
 }