Remove support for the obsolete <isindex> tag.

Source/web/WebSearchableFormData.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 196 matching lines @@
         if (control->isDisabledFormControl() || control->name().isNull())
             continue;
 
         FormDataList dataList(*encoding);
         if (!control->appendFormData(dataList, false))
             continue;
 
         const Vector<FormDataList::Item>& items = dataList.items();
 
         for (Vector<FormDataList::Item>::const_iterator j(items.begin()); j != items.end(); ++j) {
-            // Handle ISINDEX / <input name=isindex> specially, but only if it's
-            // the first entry.
-            if (!encodedString->isEmpty() || j->data() != "isindex") {
-                if (!encodedString->isEmpty())
-                    encodedString->append('&');
-                FormDataBuilder::encodeStringAsFormData(*encodedString, j->data());
-                encodedString->append('=');
-            }
+            if (!encodedString->isEmpty())
+                encodedString->append('&');
+            FormDataBuilder::encodeStringAsFormData(*encodedString, j->data());
+            encodedString->append('=');
             ++j;
             if (control == textElement) {
                 encodedString->append("{searchTerms}", 13);
                 isElementFound = true;
             } else
                 FormDataBuilder::encodeStringAsFormData(*encodedString, j->data());
         }
     }
     return isElementFound;
 }
@@ skipping 52 matching lines @@
 
     String action(formElement->action());
     KURL url(formElement->document().completeURL(action.isNull() ? "" : action));
     RefPtr<FormData> formData = FormData::create(encodedString);
     url.setQuery(formData->flattenToString());
     m_url = url;
     m_encoding = String(encoding.name());
 }
 
 } // namespace blink