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

runtime/bin/websocket_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.
 
 const String _webSocketGUID = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
 
 class _WebSocketMessageType {
   static const int NONE = 0;
   static const int BINARY = 1;
   static const int TEXT = 2;
@@ skipping 199 matching lines @@
               }
             }
 
             // Hack - as we always do index++ below.
             index--;
         }
 
         // Move to the next byte.
         index++;
       }
-    } catch (var e) {
+    } catch (e) {
       _reportError(e);
     }
   }
 
   /**
    * Indicate that the underlying communication channel has been closed.
    */
   void closed() {
     if (_state == START || _state == CLOSED || _state == FAILURE) return;
     _reportError(new WebSocketException("Protocol error $_state"));
@@ skipping 651 matching lines @@
 
 class _WebSocketCloseEvent implements CloseEvent {
   _WebSocketCloseEvent(this._wasClean, this._code, this._reason);
   bool get wasClean => _wasClean;
   int get code => _code;
   String get reason => _reason;
   bool _wasClean;
   int _code;
   String _reason;
 }