Convert //ios from scoped_ptr to std::unique_ptr.

ios/chrome/browser/autocomplete/autocomplete_provider_client_impl.h

 // Copyright 2015 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 IOS_CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_PROVIDER_CLIENT_IMPL_H_
 #define IOS_CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_PROVIDER_CLIENT_IMPL_H_
 
 #include "base/macros.h"
 #include "components/omnibox/browser/autocomplete_provider_client.h"
 #include "ios/chrome/browser/autocomplete/autocomplete_scheme_classifier_impl.h"
@@ skipping 19 matching lines @@
   history::HistoryService* GetHistoryService() override;
   scoped_refptr<history::TopSites> GetTopSites() override;
   bookmarks::BookmarkModel* GetBookmarkModel() override;
   history::URLDatabase* GetInMemoryDatabase() override;
   InMemoryURLIndex* GetInMemoryURLIndex() override;
   TemplateURLService* GetTemplateURLService() override;
   const TemplateURLService* GetTemplateURLService() const override;
   const SearchTermsData& GetSearchTermsData() const override;
   scoped_refptr<ShortcutsBackend> GetShortcutsBackend() override;
   scoped_refptr<ShortcutsBackend> GetShortcutsBackendIfExists() override;
-  scoped_ptr<KeywordExtensionsDelegate> GetKeywordExtensionsDelegate(
+  std::unique_ptr<KeywordExtensionsDelegate> GetKeywordExtensionsDelegate(
       KeywordProvider* keyword_provider) override;
   std::string GetAcceptLanguages() const override;
   std::string GetEmbedderRepresentationOfAboutScheme() override;
   std::vector<base::string16> GetBuiltinURLs() override;
   std::vector<base::string16> GetBuiltinsToProvideAsUserTypes() override;
   bool IsOffTheRecord() const override;
   bool SearchSuggestEnabled() const override;
   bool TabSyncEnabledAndUnencrypted() const override;
   void Classify(
       const base::string16& text,
@@ skipping 11 matching lines @@
 
  private:
   ios::ChromeBrowserState* browser_state_;
   AutocompleteSchemeClassifierImpl scheme_classifier_;
   ios::UIThreadSearchTermsData search_terms_data_;
 
   DISALLOW_COPY_AND_ASSIGN(AutocompleteProviderClientImpl);
 };
 
 #endif  // IOS_CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_PROVIDER_CLIENT_IMPL_H_