Fix DeleteFile of an empty path on Windows XP.

base/file_util_win.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/file_util.h"
 
 #include <windows.h>
 #include <psapi.h>
 #include <shellapi.h>
 #include <shlobj.h>
@@ skipping 33 matching lines @@
     return FilePath();
   return FilePath(file_path);
 }
 
 bool DeleteFile(const FilePath& path, bool recursive) {
   ThreadRestrictions::AssertIOAllowed();
 
   if (path.value().length() >= MAX_PATH)
     return false;
 
+  // On XP SHFileOperation will return ERROR_ACCESS_DENIED instead of
+  // ERROR_FILE_NOT_FOUND, so just shortcut this here.
+  if (path.empty())
+    return true;
+
   if (!recursive) {
     // If not recursing, then first check to see if |path| is a directory.
     // If it is, then remove it with RemoveDirectory.
     File::Info file_info;
     if (GetFileInfo(path, &file_info) && file_info.is_directory)
       return RemoveDirectory(path.value().c_str()) != 0;
 
     // Otherwise, it's a file, wildcard or non-existant. Try DeleteFile first
     // because it should be faster. If DeleteFile fails, then we fall through
     // to SHFileOperation, which will do the right thing.
@@ skipping 716 matching lines @@
     // Like Move, this function is not transactional, so we just
     // leave the copied bits behind if deleting from_path fails.
     // If to_path exists previously then we have already overwritten
     // it by now, we don't get better off by deleting the new bits.
   }
   return false;
 }
 
 }  // namespace internal
 }  // namespace base