libaddressinput - reduce number of copies in storage class by 2

third_party/libaddressinput/chromium/chrome_storage_impl.h

 // 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.
 
 #ifndef THIRD_PARTY_LIBADDRESSINPUT_CHROMIUM_CHROME_STORAGE_IMPL_H_
 #define THIRD_PARTY_LIBADDRESSINPUT_CHROMIUM_CHROME_STORAGE_IMPL_H_
 
 #include <list>
 #include <string>
 
 #include "base/memory/scoped_vector.h"
 #include "base/prefs/pref_store.h"
 #include "base/scoped_observer.h"
 #include "third_party/libaddressinput/chromium/cpp/include/libaddressinput/storage.h"
 #include "third_party/libaddressinput/chromium/cpp/include/libaddressinput/util/scoped_ptr.h"
 
 class WriteablePrefStore;
 
 // An implementation of the Storage interface which passes through to an
 // underlying WriteablePrefStore.
 class ChromeStorageImpl : public i18n::addressinput::Storage,
                           public PrefStore::Observer {
  public:
   // |store| must outlive |this|.
   explicit ChromeStorageImpl(WriteablePrefStore* store);
   virtual ~ChromeStorageImpl();
 
   // i18n::addressinput::Storage implementation.
-  virtual void Put(const std::string& key, const std::string& data) OVERRIDE;
+  virtual void Put(const std::string& key, scoped_ptr<std::string> data)
+      OVERRIDE;
   virtual void Get(const std::string& key, scoped_ptr<Callback> data_ready)
       const OVERRIDE;
 
   // PrefStore::Observer implementation.
   virtual void OnPrefValueChanged(const std::string& key) OVERRIDE;
   virtual void OnInitializationCompleted(bool succeeded) OVERRIDE;
 
  private:
   struct Request {
     Request(const std::string& key, scoped_ptr<Callback> callback);
 
     std::string key;
     scoped_ptr<Callback> callback;
   };
 
   // Non-const version of Get().
   void DoGet(const std::string& key, scoped_ptr<Callback> data_ready);
 
   WriteablePrefStore* backing_store_;  // weak
 
   // Get requests that haven't yet been serviced.
   ScopedVector<Request> outstanding_requests_;
 
   ScopedObserver<PrefStore, ChromeStorageImpl> scoped_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeStorageImpl);
 };
 
 #endif  // THIRD_PARTY_LIBADDRESSINPUT_CHROMIUM_CHROME_STORAGE_IMPL_H_