[Sync] Remove CleanupDisabledTypes command and move purge logic into SyncManager.

sync/engine/cleanup_disabled_types_command.cc

Index: sync/engine/cleanup_disabled_types_command.cc
diff --git a/sync/engine/cleanup_disabled_types_command.cc b/sync/engine/cleanup_disabled_types_command.cc
deleted file mode 100644
index d7dc7a69075f4e4804c58bd5d3d159f142212a50..0000000000000000000000000000000000000000
--- a/sync/engine/cleanup_disabled_types_command.cc
+++ /dev/null
@@ -1,67 +0,0 @@
-// Copyright (c) 2012 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 "sync/engine/cleanup_disabled_types_command.h"
-
-#include <algorithm>
-
-#include "sync/internal_api/public/base/model_type.h"
-#include "sync/sessions/sync_session.h"
-#include "sync/sessions/sync_session_context.h"
-#include "sync/syncable/directory.h"
-
-namespace syncer {
-
-CleanupDisabledTypesCommand::CleanupDisabledTypesCommand() {}
-CleanupDisabledTypesCommand::~CleanupDisabledTypesCommand() {}
-
-SyncerError CleanupDisabledTypesCommand::ExecuteImpl(
-    sessions::SyncSession* session) {
-  // Because a full directory purge is slow, we avoid purging
-  // undesired types unless we have reason to believe they were
-  // previously enabled.  Because purging could theoretically fail on
-  // the first sync session (when there's no previous routing info) we
-  // pay the full directory scan price once and do a "deep clean" of
-  // types that may potentially need cleanup so that we converge to
-  // the correct state.
-  //
-  //                          in_previous  |   !in_previous
-  //                                       |
-  //   initial_sync_ended     should clean |  may have attempted cleanup
-  //  !initial_sync_ended     should clean |  may have never been enabled, or
-  //                                       |  could have been disabled before
-  //                                       |  initial sync ended and cleanup
-  //                                       |  may not have happened yet
-  //                                       |  (failure, browser restart
-  //                                       |  before another sync session,..)
-
-  const ModelTypeSet enabled_types =
-      GetRoutingInfoTypes(session->routing_info());
-
-  const ModelTypeSet previous_enabled_types =
-      GetRoutingInfoTypes(
-          session->context()->previous_session_routing_info());
-
-  ModelTypeSet to_cleanup = Difference(ModelTypeSet::All(), enabled_types);
-
-  // If |previous_enabled_types| is non-empty (i.e., not the first
-  // sync session), set |to_cleanup| to its intersection with
-  // |previous_enabled_types|.
-  if (!previous_enabled_types.Empty()) {
-    to_cleanup.RetainAll(previous_enabled_types);
-  }
-
-  DVLOG(1) << "enabled_types = " << ModelTypeSetToString(enabled_types)
-           << ", previous_enabled_types = "
-           << ModelTypeSetToString(previous_enabled_types)
-           << ", to_cleanup = " << ModelTypeSetToString(to_cleanup);
-
-  if (to_cleanup.Empty())
-    return SYNCER_OK;
-
-  session->context()->directory()->PurgeEntriesWithTypeIn(to_cleanup);
-  return SYNCER_OK;
-}
-
-}  // namespace syncer