Coverity: Pass parameters by reference.

chrome/browser/sync/glue/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_MODEL_ASSOCIATOR_H_
 #define CHROME_BROWSER_SYNC_GLUE_MODEL_ASSOCIATOR_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "chrome/browser/sync/syncable/model_type.h"
@@ skipping 42 matching lines @@
 // This template is appropriate for data types where a Node* makes sense for
 // referring to a particular item.  If we encounter a type that does not fit
 // in this world, we may want to have several PerDataType templates.
 template <class Node, class IDType>
 class PerDataTypeAssociatorInterface : public AssociatorInterface {
  public:
   virtual ~PerDataTypeAssociatorInterface() {}
   // 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(IDType id) = 0;
+  virtual int64 GetSyncIdFromChromeId(const IDType& id) = 0;
 
   // Returns the chrome node for the given sync id.
   // Returns NULL if no node is found for the given sync id.
   virtual const Node* GetChromeNodeFromSyncId(int64 sync_id) = 0;
 
   // 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(IDType node_id,
+  virtual bool InitSyncNodeFromChromeId(const IDType& node_id,
                                         sync_api::BaseNode* sync_node) = 0;
 
   // Associates the given chrome node with the given sync id.
   virtual void Associate(const Node* node, int64 sync_id) = 0;
 
   // Remove the association that corresponds to the given sync id.
   virtual void Disassociate(int64 sync_id) = 0;
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_GLUE_MODEL_ASSOCIATOR_H_