Revert of Add SyncScheduler for scheduling CryptAuth enrollments and syncing devices.

components/proximity_auth/cryptauth/sync_scheduler.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/proximity_auth/cryptauth/sync_scheduler.h"
-
-#include "components/proximity_auth/logging/logging.h"
-
-namespace proximity_auth {
-
-SyncScheduler::SyncRequest::SyncRequest(
-    base::WeakPtr<SyncScheduler> sync_scheduler)
-    : sync_scheduler_(sync_scheduler), completed_(false) {
-}
-
-SyncScheduler::SyncRequest::~SyncRequest() {
-  if (!completed_)
-    PA_LOG(ERROR) << "SyncRequest destroyed but Complete() was never called";
-}
-
-void SyncScheduler::SyncRequest::OnDidComplete(bool success) {
-  if (sync_scheduler_) {
-    sync_scheduler_->OnSyncCompleted(success);
-    sync_scheduler_.reset();
-    completed_ = true;
-  } else {
-    PA_LOG(ERROR) << "SyncRequest completed, but SyncScheduler destroyed.";
-  }
-}
-
-}  // proximity_auth