Establish components/autofill and move some files

chrome/common/autofill/web_element_descriptor.h

-// 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.
-
-#ifndef CHROME_COMMON_AUTOFILL_WEB_ELEMENT_DESCRIPTOR_H_
-#define CHROME_COMMON_AUTOFILL_WEB_ELEMENT_DESCRIPTOR_H_
-
-#include <string>
-
-namespace autofill {
-
-// Holds information that can be used to retrieve an element.
-struct WebElementDescriptor {
-  enum RetrievalMethod {
-    CSS_SELECTOR,
-    ID,
-    NONE,
-  };
-
-  WebElementDescriptor();
-
-  // Information to retrieve element with.
-  std::string descriptor;
-
-  // Which retrieval method to use.
-  RetrievalMethod retrieval_method;
-};
-
-}  // namespace autofill
-
-#endif  // CHROME_COMMON_AUTOFILL_WEB_ELEMENT_DESCRIPTOR_H_