Fix DeleteFile of an empty path on Windows XP.

base/file_util_win.cc

Index: base/file_util_win.cc
diff --git a/base/file_util_win.cc b/base/file_util_win.cc
index eb9c6dc23dcf3f3eff8177d6c5083f7a9318385d..adf6608f4e3f16e32238fb46c6b2ae2cbaa5fc04 100644
--- a/base/file_util_win.cc
+++ b/base/file_util_win.cc
@@ -51,6 +51,11 @@ bool DeleteFile(const FilePath& path, bool recursive) {
   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.