[Autofill] Enable heuristic detection of credit card issuer fields.

chrome/browser/autofill/email_field.h

 // Copyright (c) 2011 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_BROWSER_AUTOFILL_EMAIL_FIELD_H_
 #define CHROME_BROWSER_AUTOFILL_EMAIL_FIELD_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "chrome/browser/autofill/form_field.h"
 
 class EmailField : public FormField {
  public:
-  static FormField* Parse(AutofillScanner* scanner, bool parse_new_field_types);
+  static FormField* Parse(AutofillScanner* scanner);
 
  protected:
   // FormField:
   virtual bool ClassifyField(FieldTypeMap* map) const OVERRIDE;
 
  private:
   explicit EmailField(const AutofillField* field);
 
   const AutofillField* field_;
 
   DISALLOW_COPY_AND_ASSIGN(EmailField);
 };
 
 #endif  // CHROME_BROWSER_AUTOFILL_EMAIL_FIELD_H_