Spelling fixes e to i.

runtime/bin/directory_win.cc

 // 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.
 
 #include "platform/globals.h"
 #if defined(HOST_OS_WINDOWS)
 
 #include "bin/directory.h"
 #include "bin/file.h"
 #include "bin/utils.h"
@@ skipping 474 matching lines @@
 
 
 bool Directory::Rename(const char* path, const char* new_path) {
   Utf8ToWideScope system_path(path);
   Utf8ToWideScope system_new_path(new_path);
   ExistsResult exists = ExistsHelper(system_path.wide());
   if (exists != EXISTS) {
     return false;
   }
   ExistsResult new_exists = ExistsHelper(system_new_path.wide());
-  // MoveFile does not allow replacing exising directories. Therefore,
+  // MoveFile does not allow replacing existing directories. Therefore,
   // if the new_path is currently a directory we need to delete it
   // first.
   if (new_exists == EXISTS) {
     bool success = Delete(new_path, true);
     if (!success) {
       return false;
     }
   }
   DWORD flags = MOVEFILE_WRITE_THROUGH;
   int move_status =
       MoveFileExW(system_path.wide(), system_new_path.wide(), flags);
   return (move_status != 0);
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(HOST_OS_WINDOWS)