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

ios/chrome/browser/dom_distiller/distiller_viewer.cc

 // 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/chrome/browser/dom_distiller/distiller_viewer.h"
 
 #include <string>
 #include <utility>
 
 #include "components/dom_distiller/core/distilled_page_prefs.h"
@@ skipping 14 matching lines @@
     : DomDistillerRequestViewBase(
           new DistilledPagePrefs(browser_state->GetPrefs())),
       url_(url),
       callback_(callback) {
   DCHECK(browser_state);
   DCHECK(url.is_valid());
   dom_distiller::DomDistillerService* distillerService =
       dom_distiller::DomDistillerServiceFactory::GetForBrowserState(
           browser_state);
 
-  scoped_ptr<ViewerHandle> viewer_handle = distillerService->ViewUrl(
+  std::unique_ptr<ViewerHandle> viewer_handle = distillerService->ViewUrl(
       this, distillerService->CreateDefaultDistillerPage(gfx::Size()), url);
 
   TakeViewerHandle(std::move(viewer_handle));
 }
 
 DistillerViewer::~DistillerViewer() {
 }
 
 void DistillerViewer::OnArticleReady(
     const dom_distiller::DistilledArticleProto* article_proto) {
   DomDistillerRequestViewBase::OnArticleReady(article_proto);
 
   const std::string html = viewer::GetUnsafeArticleTemplateHtml(
       url_.spec(), distilled_page_prefs_->GetTheme(),
       distilled_page_prefs_->GetFontFamily());
 
   std::string html_and_script(html);
   html_and_script +=
       "<script> distiller_on_ios = true; " + js_buffer_ + "</script>";
   callback_.Run(url_, html_and_script);
 }
 
 void DistillerViewer::SendJavaScript(const std::string& buffer) {
   js_buffer_ += buffer;
 }
 
 }  // namespace dom_distiller