Returning const ref instead of const value in DictionaryPreferenceIterator::url

net/sdch/sdch_owner.cc

 // Copyright 2014 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 "net/sdch/sdch_owner.h"
 
 #include "base/bind.h"
 #include "base/debug/alias.h"
 #include "base/logging.h"
 #include "base/metrics/histogram_macros.h"
@@ skipping 105 matching lines @@
 // only be safely used on sanitized pref stores that are known to conform to the
 // pref store schema.
 class DictionaryPreferenceIterator {
  public:
   explicit DictionaryPreferenceIterator(WriteablePrefStore* pref_store);
 
   bool IsAtEnd() const;
   void Advance();
 
   const std::string& server_hash() const { return server_hash_; }
-  const GURL url() const { return url_; }
+  const GURL& url() const { return url_; }
   base::Time last_used() const { return last_used_; }
   int use_count() const { return use_count_; }
   int size() const { return size_; }
 
  private:
   void LoadDictionaryOrDie();
 
   std::string server_hash_;
   GURL url_;
   base::Time last_used_;
@@ skipping 575 matching lines @@
   }
 
   return true;
 }
 
 bool SdchOwner::IsPersistingDictionaries() const {
   return in_memory_pref_store_.get() != nullptr;
 }
 
 }  // namespace net