dart2js: Fix minor indentation issues.

pkg/compiler/lib/src/source_file_provider.dart

 // Copyright (c) 2013, 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 source_file_provider;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 import 'dart:math' as math;
@@ skipping 158 matching lines @@
     if (isInfo && uri == null && kind != api.Diagnostic.INFO) {
       info(message, kind);
       return;
     }
 
     message = prefixMessage(message, kind);
 
     // [lastKind] records the previous non-INFO kind we saw.
     // This is used to suppress info about a warning when warnings are
     // suppressed, and similar for hints.
-     if (kind != api.Diagnostic.INFO) {
+    if (kind != api.Diagnostic.INFO) {
       lastKind = kind;
     }
     var color;
     if (kind == api.Diagnostic.ERROR) {
       color = colors.red;
     } else if (kind == api.Diagnostic.WARNING) {
       if (!showWarnings) return;
       color = colors.magenta;
     } else if (kind == api.Diagnostic.HINT) {
       if (!showHints) return;
@@ skipping 131 matching lines @@
   var onAdd, onClose;
 
   EventSinkWrapper(this.onAdd, this.onClose);
 
   void add(String data) => onAdd(data);
 
   void addError(error, [StackTrace stackTrace]) => throw error;
 
   void close() => onClose();
 }