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

ios/chrome/browser/browser_state/chrome_browser_state_manager_impl.cc

 // Copyright 2013 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/chrome/browser/browser_state/chrome_browser_state_manager_impl.h"
 
 #include <stdint.h>
 #include <utility>
 
 #include "base/files/file_enumerator.h"
@@ skipping 123 matching lines @@
 
 ios::ChromeBrowserState* ChromeBrowserStateManagerImpl::GetBrowserState(
     const base::FilePath& path) {
   // If the browser state is already loaded, just return it.
   auto iter = browser_states_.find(path);
   if (iter != browser_states_.end()) {
     DCHECK(iter->second.get());
     return iter->second.get();
   }
 
-  scoped_ptr<ChromeBrowserStateImpl> browser_state_impl(
+  std::unique_ptr<ChromeBrowserStateImpl> browser_state_impl(
       new ChromeBrowserStateImpl(path));
   DCHECK(!browser_state_impl->IsOffTheRecord());
 
   std::pair<ChromeBrowserStateImplPathMap::iterator, bool> insert_result =
       browser_states_.insert(
           std::make_pair(path, std::move(browser_state_impl)));
   DCHECK(insert_result.second);
   DCHECK(insert_result.first != browser_states_.end());
 
   DoFinalInit(insert_result.first->second.get());
@@ skipping 90 matching lines @@
       cache->GetIndexOfBrowserStateWithPath(browser_state->GetStatePath());
   if (browser_state_index != std::string::npos) {
     // The BrowserStateInfoCache's info must match the Signin Manager.
     cache->SetAuthInfoOfBrowserStateAtIndex(browser_state_index,
                                             account_info.gaia, username);
     return;
   }
   cache->AddBrowserState(browser_state->GetStatePath(), account_info.gaia,
                          username);
 }