Spelling fixes e to i.

runtime/bin/vmservice/loader.dart

 // Copyright (c) 2015, 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.
 
 part of vmservice_io;
 
 _sanitizeWindowsPath(path) {
   // For Windows we need to massage the paths a bit according to
   // http://blogs.msdn.com/b/ie/archive/2006/12/06/file-uris-in-windows.aspx
   //
@@ skipping 766 matching lines @@
     if (traceLoading) {
       _log("Error loading packages: $e\n$s");
     }
     sp.send("Uncaught error ($e) loading packages file.");
   }
 }
 
 _findPackagesFile(SendPort sp, bool traceLoading, Uri base) async {
   try {
     // Walk up the directory hierarchy to check for the existence of
-    // .packages files in parent directories and for the existense of a
+    // .packages files in parent directories and for the existence of a
     // packages/ directory on the first iteration.
     var dir = new File.fromUri(base).parent;
     var prev = null;
     // Keep searching until we reach the root.
     while ((prev == null) || (prev.path != dir.path)) {
       // Check for the existence of a .packages file and if it exists try to
       // load and parse it.
       var dirUri = dir.uri;
       var packagesFile = dirUri.resolve(".packages");
       if (traceLoading) {
@@ skipping 361 matching lines @@
           msg[3] = null;
           msg[4] = e.toString();
           sp.send(msg);
         }
       });
       break;
     default:
       _log('Unknown loader request tag=$tag from $isolateId');
   }
 }