[Sync] Deprecate old histograms

components/sync_driver/glue/sync_backend_host_core.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 "components/sync_driver/glue/sync_backend_host_core.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/location.h"
-#include "base/metrics/histogram.h"
 #include "base/single_thread_task_runner.h"
 #include "components/data_use_measurement/core/data_use_user_data.h"
 #include "components/invalidation/public/invalidation_util.h"
 #include "components/invalidation/public/object_id_invalidation_map.h"
 #include "components/sync_driver/glue/sync_backend_registrar.h"
 #include "components/sync_driver/invalidation_adapter.h"
 #include "components/sync_driver/local_device_info_provider_impl.h"
 #include "sync/internal_api/public/events/protocol_event.h"
 #include "sync/internal_api/public/http_post_provider_factory.h"
 #include "sync/internal_api/public/internal_components_factory.h"
@@ skipping 17 matching lines @@
 namespace syncer {
 class InternalComponentsFactory;
 }  // namespace syncer
 
 namespace net {
 class URLFetcher;
 }
 
 namespace {
 
-// Enums for UMAs.
-enum SyncBackendInitState {
-    SETUP_COMPLETED_FOUND_RESTORED_TYPES = 0,
-    SETUP_COMPLETED_NO_RESTORED_TYPES,
-    FIRST_SETUP_NO_RESTORED_TYPES,
-    FIRST_SETUP_RESTORED_TYPES,
-    SYNC_BACKEND_INIT_STATE_COUNT
-};
-
 void BindFetcherToDataTracker(net::URLFetcher* fetcher) {
   data_use_measurement::DataUseUserData::AttachToFetcher(
       fetcher, data_use_measurement::DataUseUserData::SYNC);
 }
 
 }  // namespace
 
 namespace browser_sync {
 
 DoInitializeOptions::DoInitializeOptions(
@@ skipping 112 matching lines @@
   // SaveChanges.
   sync_loop_->task_runner()->PostTask(
       FROM_HERE, base::Bind(&SyncBackendHostCore::StartSavingChanges,
                             weak_ptr_factory_.GetWeakPtr()));
 
   // Hang on to these for a while longer.  We're not ready to hand them back to
   // the UI thread yet.
   js_backend_ = js_backend;
   debug_info_listener_ = debug_info_listener;
 
-  // Track whether or not sync DB and preferences were in sync.
-  SyncBackendInitState backend_init_state;
-  if (has_sync_setup_completed_ && !restored_types.Empty()) {
-    backend_init_state = SETUP_COMPLETED_FOUND_RESTORED_TYPES;
-  } else if (has_sync_setup_completed_ && restored_types.Empty()) {
-    backend_init_state = SETUP_COMPLETED_NO_RESTORED_TYPES;
-  } else if (!has_sync_setup_completed_ && restored_types.Empty()) {
-    backend_init_state = FIRST_SETUP_NO_RESTORED_TYPES;
-  } else {  // (!has_sync_setup_completed_ && !restored_types.Empty())
-    backend_init_state = FIRST_SETUP_RESTORED_TYPES;
-  }
-
-  UMA_HISTOGRAM_ENUMERATION("Sync.BackendInitializeRestoreState",
-                            backend_init_state,
-                            SYNC_BACKEND_INIT_STATE_COUNT);
-
   // Before proceeding any further, we need to download the control types and
   // purge any partial data (ie. data downloaded for a type that was on its way
   // to being initially synced, but didn't quite make it.).  The following
   // configure cycle will take care of this.  It depends on the registrar state
   // which we initialize below to ensure that we don't perform any downloads if
   // all control types have already completed their initial sync.
   registrar_->SetInitialTypes(restored_types);
 
   syncer::ConfigureReason reason =
       restored_types.Empty() ?
@@ skipping 571 matching lines @@
 
 void SyncBackendHostCore::ClearServerDataDone(
     const base::Closure& frontend_callback) {
   DCHECK_EQ(base::MessageLoop::current(), sync_loop_);
   host_.Call(FROM_HERE, &SyncBackendHostImpl::ClearServerDataDoneOnFrontendLoop,
              frontend_callback);
 }
 
 
 }  // namespace browser_sync