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

ios/web/navigation/navigation_item_impl.mm

 // Copyright 2014 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/navigation/navigation_item_impl.h"
 
 #include <stddef.h>
 
+#include <memory>
 #include <utility>
 
 #include "base/logging.h"
-#include "base/memory/scoped_ptr.h"
 #include "components/url_formatter/url_formatter.h"
 #include "ui/base/page_transition_types.h"
 #include "ui/gfx/text_elider.h"
 
 namespace {
 
 // Returns a new unique ID for use in NavigationItem during construction.  The
 // returned ID is guaranteed to be nonzero (which is the "no ID" indicator).
 static int GetUniqueIDInConstructor() {
   static int unique_id_counter = 0;
   return ++unique_id_counter;
 }
 
 }  // namespace
 
 namespace web {
 
 // static
-scoped_ptr<NavigationItem> NavigationItem::Create() {
-  return scoped_ptr<NavigationItem>(new NavigationItemImpl());
+std::unique_ptr<NavigationItem> NavigationItem::Create() {
+  return std::unique_ptr<NavigationItem>(new NavigationItemImpl());
 }
 
 NavigationItemImpl::NavigationItemImpl()
     : unique_id_(GetUniqueIDInConstructor()),
       transition_type_(ui::PAGE_TRANSITION_LINK),
       is_overriding_user_agent_(false),
       is_created_from_push_state_(false),
       should_skip_resubmit_data_confirmation_(false),
       is_renderer_initiated_(false),
       is_unsafe_(false),
@@ skipping 21 matching lines @@
       should_skip_resubmit_data_confirmation_(
           item.should_skip_resubmit_data_confirmation_),
       post_data_([item.post_data_ copy]),
       is_renderer_initiated_(item.is_renderer_initiated_),
       is_unsafe_(item.is_unsafe_),
       cached_display_title_(item.cached_display_title_),
       facade_delegate_(nullptr) {
 }
 
 void NavigationItemImpl::SetFacadeDelegate(
-    scoped_ptr<NavigationItemFacadeDelegate> facade_delegate) {
+    std::unique_ptr<NavigationItemFacadeDelegate> facade_delegate) {
   facade_delegate_ = std::move(facade_delegate);
 }
 
 NavigationItemFacadeDelegate* NavigationItemImpl::GetFacadeDelegate() const {
   return facade_delegate_.get();
 }
 
 int NavigationItemImpl::GetUniqueID() const {
   return unique_id_;
 }
@@ skipping 185 matching lines @@
   http_request_headers_.reset();
 }
 
 void NavigationItemImpl::ResetForCommit() {
   // Any state that only matters when a navigation item is pending should be
   // cleared here.
   set_is_renderer_initiated(false);
 }
 
 }  // namespace web