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

ios/web/interstitials/html_web_interstitial_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_WEB_INTERSTITIALS_HTML_WEB_INTERSTITIAL_IMPL_H_
 #define IOS_WEB_INTERSTITIALS_HTML_WEB_INTERSTITIAL_IMPL_H_
 
 #import <WebKit/WebKit.h>
 
+#include <memory>
+
 #include "base/mac/scoped_nsobject.h"
-#include "base/memory/scoped_ptr.h"
 #include "ios/web/interstitials/web_interstitial_impl.h"
 
 namespace web {
 
 class HtmlWebInterstitialDelegate;
 class HtmlWebInterstitialImpl;
 
 // A concrete subclass of WebInterstitialImpl that is used to display
 // interstitials created via HTML.
 class HtmlWebInterstitialImpl : public WebInterstitialImpl {
  public:
-  HtmlWebInterstitialImpl(WebStateImpl* web_state,
-                          bool new_navigation,
-                          const GURL& url,
-                          scoped_ptr<HtmlWebInterstitialDelegate> delegate);
+  HtmlWebInterstitialImpl(
+      WebStateImpl* web_state,
+      bool new_navigation,
+      const GURL& url,
+      std::unique_ptr<HtmlWebInterstitialDelegate> delegate);
   ~HtmlWebInterstitialImpl() override;
 
   // Called by |web_view_controller_delegate_| when |web_view_controller_|
   // receives a JavaScript command.
   void CommandReceivedFromWebView(NSString* command);
 
   // WebInterstitialImpl implementation:
   CRWContentView* GetContentView() const override;
 
  protected:
   // WebInterstitialImpl implementation:
   void PrepareForDisplay() override;
   WebInterstitialDelegate* GetDelegate() const override;
   void EvaluateJavaScript(NSString* script,
                           JavaScriptCompletion completionHandler) override;
 
  private:
   // The HTML interstitial delegate.
-  scoped_ptr<HtmlWebInterstitialDelegate> delegate_;
+  std::unique_ptr<HtmlWebInterstitialDelegate> delegate_;
   // The |web_view_|'s delegate.  Used to forward JavaScript commands
   // resulting from user interaction with the interstitial content.
   base::scoped_nsprotocol<id<WKNavigationDelegate>> web_view_delegate_;
   // The web view used to show the content. View needs to be resized by the
   // caller.
   base::scoped_nsobject<WKWebView> web_view_;
   // The CRWContentView used to display |web_view_controller_|'s view.
   base::scoped_nsobject<CRWContentView> content_view_;
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_INTERSTITIALS_HTML_WEB_INTERSTITIAL_IMPL_H_