Coverity: Pass parameters by reference.

chrome/browser/sync/glue/session_model_associator.h

Index: chrome/browser/sync/glue/session_model_associator.h
diff --git a/chrome/browser/sync/glue/session_model_associator.h b/chrome/browser/sync/glue/session_model_associator.h
index 89d30be679ff7f53a913d9781adca9902129c5d8..b10d29035164f3451062c5444c6dbd7f42e4723d 100644
--- a/chrome/browser/sync/glue/session_model_associator.h
+++ b/chrome/browser/sync/glue/session_model_associator.h
@@ -93,14 +93,14 @@ class SessionModelAssociator : public 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(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;
   }