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

ios/web/navigation/crw_session_controller.mm

 // Copyright 2012 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/navigation/crw_session_controller.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <utility>
@@ skipping 170 matching lines @@
     _tabId = [[self uniqueID] retain];
     _openerId = nil;
     _browserState = browserState;
 
     // Create entries array from list of navigations.
     _entries = [[NSMutableArray alloc] initWithCapacity:scoped_items.size()];
     std::vector<web::NavigationItem*> items;
     scoped_items.release(&items);
 
     for (size_t i = 0; i < items.size(); ++i) {
-      scoped_ptr<web::NavigationItem> item(items[i]);
+      std::unique_ptr<web::NavigationItem> item(items[i]);
       base::scoped_nsobject<CRWSessionEntry> entry(
           [[CRWSessionEntry alloc] initWithNavigationItem:std::move(item)]);
       [_entries addObject:entry];
     }
     self.currentNavigationIndex = currentIndex;
     // Prior to M34, 0 was used as "no index" instead of -1; adjust for that.
     if (![_entries count])
       self.currentNavigationIndex = -1;
     if (_currentNavigationIndex >= static_cast<NSInteger>(items.size())) {
       self.currentNavigationIndex = static_cast<NSInteger>(items.size()) - 1;
@@ skipping 664 matching lines @@
 }
 
 - (CRWSessionEntry*)sessionEntryWithURL:(const GURL&)url
                                referrer:(const web::Referrer&)referrer
                              transition:(ui::PageTransition)transition
                     useDesktopUserAgent:(BOOL)useDesktopUserAgent
                       rendererInitiated:(BOOL)rendererInitiated {
   GURL loaded_url(url);
   BOOL urlWasRewritten = NO;
   if (_navigationManager) {
-    scoped_ptr<std::vector<web::BrowserURLRewriter::URLRewriter>>
+    std::unique_ptr<std::vector<web::BrowserURLRewriter::URLRewriter>>
         transientRewriters = _navigationManager->GetTransientURLRewriters();
     if (transientRewriters) {
       urlWasRewritten = web::BrowserURLRewriter::RewriteURLWithWriters(
           &loaded_url, _browserState, *transientRewriters.get());
     }
   }
   if (!urlWasRewritten) {
     web::BrowserURLRewriter::GetInstance()->RewriteURLIfNecessary(
         &loaded_url, _browserState);
   }
-  scoped_ptr<web::NavigationItemImpl> item(new web::NavigationItemImpl());
+  std::unique_ptr<web::NavigationItemImpl> item(new web::NavigationItemImpl());
   item->SetURL(loaded_url);
   item->SetReferrer(referrer);
   item->SetTransitionType(transition);
   item->SetIsOverridingUserAgent(useDesktopUserAgent);
   item->set_is_renderer_initiated(rendererInitiated);
   return [[[CRWSessionEntry alloc] initWithNavigationItem:std::move(item)]
       autorelease];
 }
 
 @end