Cleanup and fixes to some dart:io files

runtime/bin/websocket_impl.dart

Index: runtime/bin/websocket_impl.dart
diff --git a/runtime/bin/websocket_impl.dart b/runtime/bin/websocket_impl.dart
index f91ba1ffdbc55fa9c0a6326b705179c7b88ca2bf..32ba0c20591fbd9c096fd9c9534b86b5d59d6e0c 100644
--- a/runtime/bin/websocket_impl.dart
+++ b/runtime/bin/websocket_impl.dart
@@ -112,7 +112,6 @@ class _WebSocketProtocolProcessor {
 
             default:
               throw new WebSocketException("Protocol error");
-              break;
             }
             _state = LEN_FIRST;
             break;
@@ -190,7 +189,6 @@ class _WebSocketProtocolProcessor {
               switch (_currentMessageType) {
                 case _WebSocketMessageType.NONE:
                   throw new WebSocketException("Protocol error");
-                  break;
 
                 case _WebSocketMessageType.TEXT:
                 case _WebSocketMessageType.BINARY:
@@ -205,8 +203,6 @@ class _WebSocketProtocolProcessor {
 
                 default:
                   throw new WebSocketException("Protocol error");
-                  break;
-
               }
             }