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

ios/chrome/browser/browsing_data/browsing_data_remover_helper.cc

 // Copyright 2016 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/browsing_data/browsing_data_remover_helper.h"
 
 #include <utility>
 
 #include "ios/chrome/browser/browser_state/chrome_browser_state.h"
 
@@ skipping 24 matching lines @@
   // IOSChromeBrowsingDataRemover::is_removing() is set to false. In this
   // window, |current_remover_| needs to be checked as well.
   if (current_remover_ || IOSChromeBrowsingDataRemover::is_removing()) {
     // IOSChromeBrowsingDataRemover is not re-entrant. If it is already running,
     // add the browser_state to |pending_removals_| for later deletion. If the
     // browser_state is already scheduled for removal of browsing data, update
     // the remove mask and callbacks.
     DCHECK(current_remover_);
     auto pending_removals_iter = pending_removals_.find(browser_state);
     if (pending_removals_iter == pending_removals_.end()) {
-      scoped_ptr<BrowsingDataRemovalInfo> removal_info(
+      std::unique_ptr<BrowsingDataRemovalInfo> removal_info(
           new BrowsingDataRemovalInfo(remove_mask, callback));
       pending_removals_[browser_state] = std::move(removal_info);
     } else {
       pending_removals_iter->second->remove_mask |= remove_mask;
       pending_removals_iter->second->callbacks.push_back(callback);
     }
   } else {
-    scoped_ptr<BrowsingDataRemovalInfo> removal_info(
+    std::unique_ptr<BrowsingDataRemovalInfo> removal_info(
         new BrowsingDataRemovalInfo(remove_mask, callback));
     DoRemove(browser_state, std::move(removal_info));
   }
 }
 
 void BrowsingDataRemoverHelper::OnIOSChromeBrowsingDataRemoverDone() {
   current_remover_ = nullptr;
 
   DCHECK(current_removal_info_);
   // Inform clients of the currently finished removal operation that browsing
   // data was removed.
   for (const auto& callback : current_removal_info_->callbacks) {
     if (!callback.is_null()) {
       callback.Run();
     }
   }
   current_removal_info_.reset();
 
   if (pending_removals_.empty())
     return;
 
   ios::ChromeBrowserState* next_browser_state =
       pending_removals_.begin()->first;
-  scoped_ptr<BrowsingDataRemovalInfo> removal_info =
+  std::unique_ptr<BrowsingDataRemovalInfo> removal_info =
       std::move(pending_removals_[next_browser_state]);
   pending_removals_.erase(next_browser_state);
   DoRemove(next_browser_state, std::move(removal_info));
 }
 
 void BrowsingDataRemoverHelper::DoRemove(
     ios::ChromeBrowserState* browser_state,
-    scoped_ptr<BrowsingDataRemovalInfo> removal_info) {
+    std::unique_ptr<BrowsingDataRemovalInfo> removal_info) {
   DCHECK(!current_remover_ && !IOSChromeBrowsingDataRemover::is_removing());
 
   current_removal_info_ = std::move(removal_info);
 
   // IOSChromeBrowsingDataRemover deletes itself.
   IOSChromeBrowsingDataRemover* remover =
       IOSChromeBrowsingDataRemover::CreateForPeriod(
           browser_state, IOSChromeBrowsingDataRemover::EVERYTHING);
   remover->AddObserver(this);
   current_remover_ = remover;
   int remove_mask = current_removal_info_->remove_mask;
   remover->Remove(remove_mask);
 }