Fix unique_ptr usage in handling OAuth2TokenService::StartRequest result

components/signin/core/browser/child_account_info_fetcher_impl.cc

 // 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 "components/signin/core/browser/child_account_info_fetcher_impl.h"
 
 #include "base/strings/string_split.h"
 #include "base/trace_event/trace_event.h"
 #include "base/values.h"
 #include "components/invalidation/public/invalidation_service.h"
@@ skipping 66 matching lines @@
     UnregisterInvalidationHandler();
 }
 
 void ChildAccountInfoFetcherImpl::FetchIfNotInProgress() {
   DCHECK(thread_checker_.CalledOnValidThread());
   if (fetch_in_progress_)
     return;
   fetch_in_progress_ = true;
   OAuth2TokenService::ScopeSet scopes;
   scopes.insert(GaiaConstants::kOAuth1LoginScope);
-  login_token_request_.reset(
-      token_service_->StartRequest(account_id_, scopes, this).release());
+  login_token_request_ =
+      token_service_->StartRequest(account_id_, scopes, this);
 }
 
 void ChildAccountInfoFetcherImpl::OnGetTokenSuccess(
     const OAuth2TokenService::Request* request,
     const std::string& access_token,
     const base::Time& expiration_time) {
   TRACE_EVENT_ASYNC_STEP_PAST0("AccountFetcherService", kFetcherId, this,
                                "OnGetTokenSuccess");
   DCHECK_EQ(request, login_token_request_.get());
 
@@ skipping 72 matching lines @@
 
 void ChildAccountInfoFetcherImpl::OnIncomingInvalidation(
     const syncer::ObjectIdInvalidationMap& invalidation_map) {
   FetchIfNotInProgress();
   invalidation_map.AcknowledgeAll();
 }
 
 std::string ChildAccountInfoFetcherImpl::GetOwnerName() const {
   return std::string(kFetcherId);
 }