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

ios/web/interstitials/html_web_interstitial_impl.mm

 // 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.
 
 #import "ios/web/interstitials/html_web_interstitial_impl.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 59 matching lines @@
 
 #pragma mark -
 
 namespace web {
 
 // static
 WebInterstitial* WebInterstitial::CreateHtmlInterstitial(
     WebState* web_state,
     bool new_navigation,
     const GURL& url,
-    scoped_ptr<HtmlWebInterstitialDelegate> delegate) {
+    std::unique_ptr<HtmlWebInterstitialDelegate> delegate) {
   WebStateImpl* web_state_impl = static_cast<WebStateImpl*>(web_state);
   return new HtmlWebInterstitialImpl(web_state_impl, new_navigation, url,
                                      std::move(delegate));
 }
 
 HtmlWebInterstitialImpl::HtmlWebInterstitialImpl(
     WebStateImpl* web_state,
     bool new_navigation,
     const GURL& url,
-    scoped_ptr<HtmlWebInterstitialDelegate> delegate)
+    std::unique_ptr<HtmlWebInterstitialDelegate> delegate)
     : WebInterstitialImpl(web_state, new_navigation, url),
       delegate_(std::move(delegate)) {
   DCHECK(delegate_);
 }
 
 HtmlWebInterstitialImpl::~HtmlWebInterstitialImpl() {
 }
 
 void HtmlWebInterstitialImpl::CommandReceivedFromWebView(NSString* command) {
   delegate_->CommandReceived(base::SysNSStringToUTF8(command));
@@ skipping 24 matching lines @@
   return delegate_.get();
 }
 
 void HtmlWebInterstitialImpl::EvaluateJavaScript(
     NSString* script,
     JavaScriptCompletion completionHandler) {
   web::EvaluateJavaScript(web_view_, script, completionHandler);
 }
 
 }  // namespace web