Generate passwords only for forms that autofill server marks as account creation forms.

components/autofill/core/browser/autofill_profile.cc

 // Copyright 2013 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 "components/autofill/core/browser/autofill_profile.h"
 
 #include <algorithm>
 #include <functional>
 #include <map>
 #include <ostream>
@@ skipping 844 matching lines @@
     case PHONE_HOME:
     case PHONE_BILLING:
       return &phone_number_[0];
 
     case ADDRESS_HOME:
     case ADDRESS_BILLING:
       return &address_;
 
     case NO_GROUP:
     case CREDIT_CARD:
+    case PASSWORD_FIELD:
         return NULL;
   }
 
   NOTREACHED();
   return NULL;
 }
 
 // So we can compare AutofillProfiles with EXPECT_EQ().
 std::ostream& operator<<(std::ostream& os, const AutofillProfile& profile) {
   return os
@@ skipping 22 matching lines @@
       << UTF16ToUTF8(profile.GetRawInfo(ADDRESS_HOME_STATE))
       << " "
       << UTF16ToUTF8(profile.GetRawInfo(ADDRESS_HOME_ZIP))
       << " "
       << UTF16ToUTF8(profile.GetRawInfo(ADDRESS_HOME_COUNTRY))
       << " "
       << UTF16ToUTF8(MultiString(profile, PHONE_HOME_WHOLE_NUMBER));
 }
 
 }  // namespace autofill