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

ios/web/public/web_controller_factory.mm

 // 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.
 
 #import "ios/web/public/web_controller_factory.h"
 
 #include <utility>
 
 #include "ios/web/public/browser_state.h"
 #import "ios/web/web_state/ui/crw_wk_web_view_web_controller.h"
 #include "ios/web/web_state/web_state_impl.h"
 
 namespace web {
 
-CRWWebController* CreateWebController(scoped_ptr<WebStateImpl> web_state) {
+CRWWebController* CreateWebController(std::unique_ptr<WebStateImpl> web_state) {
   return
       [[CRWWKWebViewWebController alloc] initWithWebState:std::move(web_state)];
 }
 
 CRWWebController* CreateWebController(BrowserState* browser_state) {
   DCHECK(browser_state);
-  scoped_ptr<web::WebStateImpl> web_state(new web::WebStateImpl(browser_state));
+  std::unique_ptr<web::WebStateImpl> web_state(
+      new web::WebStateImpl(browser_state));
   web_state->GetNavigationManagerImpl().InitializeSession(nil, nil, NO, -1);
   return CreateWebController(std::move(web_state));
 }
 
 }  // namespace web