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

ios/web/interstitials/native_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.
 
 #include "ios/web/interstitials/native_web_interstitial_impl.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "ios/web/public/interstitials/web_interstitial_delegate.h"
 #import "ios/web/public/web_state/ui/crw_generic_content_view.h"
 #include "ios/web/web_state/web_state_impl.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace web {
 
 // static
 WebInterstitial* WebInterstitial::CreateNativeInterstitial(
     WebState* web_state,
     bool new_navigation,
     const GURL& url,
-    scoped_ptr<NativeWebInterstitialDelegate> delegate) {
+    std::unique_ptr<NativeWebInterstitialDelegate> delegate) {
   WebStateImpl* web_state_impl = static_cast<WebStateImpl*>(web_state);
   return new NativeWebInterstitialImpl(web_state_impl, new_navigation, url,
                                        std::move(delegate));
 }
 
 NativeWebInterstitialImpl::NativeWebInterstitialImpl(
     WebStateImpl* web_state,
     bool new_navigation,
     const GURL& url,
-    scoped_ptr<NativeWebInterstitialDelegate> delegate)
+    std::unique_ptr<NativeWebInterstitialDelegate> delegate)
     : web::WebInterstitialImpl(web_state, new_navigation, url),
       delegate_(std::move(delegate)) {
   DCHECK(delegate_);
 }
 
 NativeWebInterstitialImpl::~NativeWebInterstitialImpl() {
 }
 
 CRWContentView* NativeWebInterstitialImpl::GetContentView() const {
   return content_view_.get();
@@ skipping 10 matching lines @@
   return delegate_.get();
 }
 
 void NativeWebInterstitialImpl::EvaluateJavaScript(
     NSString* script,
     JavaScriptCompletion completionHandler) {
   NOTREACHED() << "JavaScript cannot be evaluated on native interstitials.";
 }
 
 }  // namespace web