Coverity: Pass parameters by reference.

chrome/browser/sync/glue/session_model_associator.h

 // 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.
 
 #ifndef CHROME_BROWSER_SYNC_GLUE_SESSION_MODEL_ASSOCIATOR_H_
 #define CHROME_BROWSER_SYNC_GLUE_SESSION_MODEL_ASSOCIATOR_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 75 matching lines @@
   virtual const sync_pb::SessionSpecifics* GetChromeNodeFromSyncId(
     int64 sync_id);
 
   // Returns whether a node with the given permanent tag was found and update
   // |sync_id| with that node's id.
   virtual bool GetSyncIdForTaggedNode(const std::string* tag, int64* sync_id);
 
   // Returns sync id for the given chrome model id.
   // Returns sync_api::kInvalidId if the sync node is not found for the given
   // chrome id.
-  virtual int64 GetSyncIdFromChromeId(std::string id);
+  virtual int64 GetSyncIdFromChromeId(const std::string& id);
 
 
   // Initializes the given sync node from the given chrome node id.
   // Returns false if no sync node was found for the given chrome node id or
   // if the initialization of sync node fails.
-  virtual bool InitSyncNodeFromChromeId(std::string id,
-    sync_api::BaseNode* sync_node) {
+  virtual bool InitSyncNodeFromChromeId(const std::string& id,
+                                        sync_api::BaseNode* sync_node) {
       return false;
   }
 
   // The has_nodes out parameter is set to true if the sync model has
   // nodes other than the permanent tagged nodes.  The method may
   // return false if an error occurred.
   virtual bool SyncModelHasUserCreatedNodes(bool* has_nodes);
 
   // Returns the tag used to uniquely identify this machine's session in the
   // sync model.
@@ skipping 97 matching lines @@
 
   // Consumer used to obtain the current session.
   CancelableRequestConsumer consumer_;
 
   DISALLOW_COPY_AND_ASSIGN(SessionModelAssociator);
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_GLUE_SESSION_MODEL_ASSOCIATOR_H_