Coverity: Pass parameters by reference.

chrome/browser/sync/glue/password_model_associator.h

Index: chrome/browser/sync/glue/password_model_associator.h
diff --git a/chrome/browser/sync/glue/password_model_associator.h b/chrome/browser/sync/glue/password_model_associator.h
index 22c81bab639780a6805c1920e5cf50e72d1bda71..5cf55999a27e33727dc154f70ed8be9e52c0791f 100644
--- a/chrome/browser/sync/glue/password_model_associator.h
+++ b/chrome/browser/sync/glue/password_model_associator.h
@@ -78,14 +78,14 @@ class PasswordModelAssociator
   }
 
   // Not implemented.
-  virtual bool InitSyncNodeFromChromeId(std::string node_id,
+  virtual bool InitSyncNodeFromChromeId(const std::string& node_id,
                                         sync_api::BaseNode* sync_node) {
     return false;
   }
 
   // Returns the sync id for the given password name, or sync_api::kInvalidId
   // if the password name is not associated to any sync id.
-  virtual int64 GetSyncIdFromChromeId(std::string node_id);
+  virtual int64 GetSyncIdFromChromeId(const std::string& node_id);
 
   // Associates the given password name with the given sync id.
   virtual void Associate(const std::string* node, int64 sync_id);