[Autofill] Autofill fails to fill credit card number when split across fields.

components/autofill/core/browser/autofill_scanner.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_scanner.h"
 
 #include "base/logging.h"
 #include "components/autofill/core/browser/autofill_field.h"
 
 namespace autofill {
 
-AutofillScanner::AutofillScanner(
-    const std::vector<const AutofillField*>& fields)
+AutofillScanner::AutofillScanner(std::vector<AutofillField*>& fields)
     : cursor_(fields.begin()),
       saved_cursor_(fields.begin()),
       begin_(fields.begin()),
       end_(fields.end()) {
 }
 
 AutofillScanner::~AutofillScanner() {
 }
 
 void AutofillScanner::Advance() {
   DCHECK(!IsEnd());
   ++cursor_;
 }
 
-const AutofillField* AutofillScanner::Cursor() const {
+AutofillField* AutofillScanner::Cursor() const {
   if (IsEnd()) {
     NOTREACHED();
     return NULL;
   }
 
   return *cursor_;
 }
 
 bool AutofillScanner::IsEnd() const {
   return cursor_ == end_;
@@ skipping 10 matching lines @@
   cursor_ = begin_ + index;
   saved_cursor_ = end_;
 }
 
 size_t AutofillScanner::SaveCursor() {
   saved_cursor_ = cursor_;
   return static_cast<size_t>(cursor_ - begin_);
 }
 
 }  // namespace autofill