Not store autocomplete entries in DB for forms submitted using javascript....

chrome/browser/autocomplete_history_manager.cc

 // Copyright (c) 2010 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 "chrome/browser/autocomplete_history_manager.h"
 
 #include <vector>
 
 #include "base/string16.h"
 #include "base/string_number_conversions.h"
@@ skipping 132 matching lines @@
 }
 
 void AutocompleteHistoryManager::StoreFormEntriesInWebDatabase(
     const FormData& form) {
   if (!*autofill_enabled_)
     return;
 
   if (profile_->IsOffTheRecord())
     return;
 
+  // Don't save data that was submitted through JavaScript.
+  if (!form.user_submitted)
+    return;
+
   // We put the following restriction on stored FormFields:
   //  - non-empty name
   //  - non-empty value
   //  - text field
   //  - value is not a credit card number
   //  - value is not a SSN
   std::vector<webkit_glue::FormField> values;
   for (std::vector<webkit_glue::FormField>::const_iterator iter =
            form.fields.begin();
        iter != form.fields.end(); ++iter) {
@@ skipping 18 matching lines @@
     DCHECK(result->GetType() == AUTOFILL_VALUE_RESULT);
     const WDResult<std::vector<string16> >* autofill_result =
         static_cast<const WDResult<std::vector<string16> >*>(result);
     host->AutocompleteSuggestionsReturned(
         query_id_, autofill_result->GetValue());
   } else {
     host->AutocompleteSuggestionsReturned(
         query_id_, std::vector<string16>());
   }
 }