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

ios/web/navigation/crw_session_controller_unittest.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"
 
 #import <Foundation/Foundation.h>
 
 #include <utility>
 
 #include "base/logging.h"
 #import "base/mac/scoped_nsobject.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/strings/sys_string_conversions.h"
 #import "ios/web/navigation/crw_session_controller+private_constructors.h"
 #include "ios/web/navigation/crw_session_entry.h"
 #include "ios/web/navigation/navigation_item_impl.h"
 #include "ios/web/public/referrer.h"
 #include "ios/web/public/test/test_browser_state.h"
 #include "ios/web/public/test/test_web_thread_bundle.h"
 #import "net/base/mac/url_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/gtest_mac.h"
@@ skipping 1002 matching lines @@
 
   // Remove an entry and attempt to go it. Ensure it outlives the removal.
   base::scoped_nsobject<CRWSessionEntry> entry3(
       [[session_controller_.get().entries objectAtIndex:3] retain]);
   [session_controller_ removeEntryAtIndex:3];
   [session_controller_ goToEntry:entry3];
   EXPECT_EQ(1, session_controller_.get().currentNavigationIndex);
 }
 
 }  // anonymous namespace