Coverity: Pass parameters by reference.

chrome/browser/sync/glue/password_model_associator.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/sync/glue/password_model_associator.h"
 
 #include <set>
 
 #include "base/stl_util-inl.h"
 #include "base/utf_string_conversions.h"
@@ skipping 187 matching lines @@
   AutoLock lock(abort_association_pending_lock_);
   abort_association_pending_ = true;
 }
 
 bool PasswordModelAssociator::IsAbortPending() {
   AutoLock lock(abort_association_pending_lock_);
   return abort_association_pending_;
 }
 
 int64 PasswordModelAssociator::GetSyncIdFromChromeId(
-    const std::string password) {
+    const std::string& password) {
   PasswordToSyncIdMap::const_iterator iter = id_map_.find(password);
   return iter == id_map_.end() ? sync_api::kInvalidId : iter->second;
 }
 
 void PasswordModelAssociator::Associate(
     const std::string* password, int64 sync_id) {
   DCHECK(expected_loop_ == MessageLoop::current());
   DCHECK_NE(sync_api::kInvalidId, sync_id);
   DCHECK(id_map_.find(*password) == id_map_.end());
   DCHECK(id_map_inverse_.find(sync_id) == id_map_inverse_.end());
@@ skipping 159 matching lines @@
     const std::string& password_element,
     const std::string& signon_realm) {
   return EscapePath(origin_url) + "|" +
          EscapePath(username_element) + "|" +
          EscapePath(username_value) + "|" +
          EscapePath(password_element) + "|" +
          EscapePath(signon_realm);
 }
 
 }  // namespace browser_sync