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

ios/web/navigation/crw_session_entry.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_entry.h"
 
 #include <stdint.h>
 
+#include <memory>
+
 #include "base/mac/objc_property_releaser.h"
 #include "base/mac/scoped_nsobject.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/strings/sys_string_conversions.h"
 #include "ios/web/navigation/navigation_item_impl.h"
 #include "ios/web/navigation/nscoder_util.h"
 #include "ios/web/public/navigation_item.h"
 #include "ios/web/public/web_state/page_display_state.h"
 #import "net/base/mac/url_conversions.h"
 
 namespace web {
 // Keys used to serialize web::PageScrollState properties.
 NSString* const kSessionEntryPageScrollStateKey = @"state";
@@ skipping 19 matching lines @@
 }
 
 @interface CRWSessionEntry () {
   // The original URL of the page.  In cases where a redirect occurred, |url_|
   // will contain the final post-redirect URL, and |originalUrl_| will contain
   // the pre-redirect URL.  This field is not persisted to disk.
   GURL _originalUrl;
 
   // The NavigationItemImpl corresponding to this CRWSessionEntry.
   // TODO(stuartmorgan): Move ownership to NavigationManagerImpl.
-  scoped_ptr<web::NavigationItemImpl> _navigationItem;
+  std::unique_ptr<web::NavigationItemImpl> _navigationItem;
 
   base::mac::ObjCPropertyReleaser _propertyReleaser_CRWSessionEntry;
 }
 // Redefine originalUrl to be read-write.
 @property(nonatomic, readwrite) const GURL& originalUrl;
 
 // Converts a serialized NSDictionary to a web::PageDisplayState.
 + (web::PageDisplayState)pageDisplayStateFromDictionary:
         (NSDictionary*)dictionary;
 // Serializes a web::PageDisplayState to an NSDictionary.
 + (NSDictionary*)dictionaryFromPageDisplayState:
         (const web::PageDisplayState&)displayState;
 // Returns a readable description of |displayState|.
 + (NSString*)descriptionForPageDisplayState:
         (const web::PageDisplayState&)displayState;
 @end
 
 @implementation CRWSessionEntry
 
 @synthesize originalUrl = _originalUrl;
 
-- (instancetype)initWithNavigationItem:(scoped_ptr<web::NavigationItem>)item {
+- (instancetype)initWithNavigationItem:
+    (std::unique_ptr<web::NavigationItem>)item {
   self = [super init];
   if (self) {
     _propertyReleaser_CRWSessionEntry.Init(self, [CRWSessionEntry class]);
     _navigationItem.reset(
         static_cast<web::NavigationItemImpl*>(item.release()));
     self.originalUrl = _navigationItem->GetURL();
   }
   return self;
 }
 
@@ skipping 162 matching lines @@
   return
       [NSString stringWithFormat:kPageScrollStateDescriptionFormat,
                                  displayState.scroll_state().offset_x(),
                                  displayState.scroll_state().offset_y(),
                                  displayState.zoom_state().minimum_zoom_scale(),
                                  displayState.zoom_state().maximum_zoom_scale(),
                                  displayState.zoom_state().zoom_scale()];
 }
 
 @end