Re-write many calls to WrapUnique() with MakeUnique()

ios/chrome/browser/sync/ios_chrome_sync_client.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.
 
 #include "ios/chrome/browser/sync/ios_chrome_sync_client.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 98 matching lines @@
   browser_sync::SyncedWindowDelegatesGetter* GetSyncedWindowDelegatesGetter()
       override {
     return window_delegates_getter_.get();
   }
 
   std::unique_ptr<browser_sync::LocalSessionEventRouter>
   GetLocalSessionEventRouter() override {
     syncer::SyncableService::StartSyncFlare flare(
         ios::sync_start_util::GetFlareForSyncableService(
             browser_state_->GetStatePath()));
-    return base::WrapUnique(
-        new IOSChromeLocalSessionEventRouter(browser_state_, this, flare));
+    return base::MakeUnique<IOSChromeLocalSessionEventRouter>(browser_state_,
+                                                              this, flare);
   }
 
  private:
   ios::ChromeBrowserState* const browser_state_;
   const std::unique_ptr<browser_sync::SyncedWindowDelegatesGetter>
       window_delegates_getter_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncSessionsClientImpl);
 };
 
@@ skipping 269 matching lines @@
         IOSChromeProfileSyncServiceFactory::GetForBrowserState(browser_state);
     if (profile_sync_service != nullptr) {
       const sync_driver::DeviceInfoTracker* tracker =
           profile_sync_service->GetDeviceInfoTracker();
       if (tracker != nullptr) {
         trackers->push_back(tracker);
       }
     }
   }
 }