[Sync] Remove SyncProcessBookmarkRestoreAfterDeletion feature toggle

The feature toggle was enabled by default in M83 and now it is a good
time to clean it up with related code.

Bug: 1114738
Change-Id: I87a7cb9464a0802a219527e3958e6b33a9708f0d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2346307Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Rushan Suleymanov <rushans@google.com>
Cr-Commit-Position: refs/heads/master@{#796758}

components/sync_bookmarks/bookmark_model_observer_impl.cc

@@ -109,8 +109,7 @@ void BookmarkModelObserverImpl::BookmarkNodeAdded(
   const SyncedBookmarkTracker::Entity* entity =
       bookmark_tracker_->GetTombstoneEntityForGuid(node->guid());
   const base::Time creation_time = base::Time::Now();
-  if (entity && base::FeatureList::IsEnabled(
-                    switches::kSyncProcessBookmarkRestoreAfterDeletion)) {
+  if (entity) {
     bookmark_tracker_->UndeleteTombstoneForBookmarkNode(entity, node);
     bookmark_tracker_->Update(entity, entity->metadata()->server_version(),
                               creation_time, unique_position, specifics);

components/sync_bookmarks/switches.cc

@@ -20,10 +20,6 @@ const base::Feature kMergeBookmarksUsingGUIDs{"MergeBookmarksUsingGUIDs",
 const base::Feature kSyncReuploadBookmarkFullTitles{
     "SyncReuploadBookmarkFullTitles", base::FEATURE_DISABLED_BY_DEFAULT};
 
-const base::Feature kSyncProcessBookmarkRestoreAfterDeletion{
-    "SyncProcessBookmarkRestoreAfterDeletion",
-    base::FEATURE_ENABLED_BY_DEFAULT};
-
 const base::Feature kSyncDeduplicateAllBookmarksWithSameGUID{
     "SyncDeduplicateAllBookmarksWithSameGUID",
     base::FEATURE_ENABLED_BY_DEFAULT};

components/sync_bookmarks/switches.h

@@ -15,8 +15,6 @@ extern const base::Feature kMergeBookmarksUsingGUIDs;
 // TODO(crbug.com/1066962): remove this code when most of bookmarks are
 // reuploaded.
 extern const base::Feature kSyncReuploadBookmarkFullTitles;
-// TODO(crbug.com/1071061): remove after launching.
-extern const base::Feature kSyncProcessBookmarkRestoreAfterDeletion;
 // This switch is used to disable removing of bookmark duplicates by GUID.
 extern const base::Feature kSyncDeduplicateAllBookmarksWithSameGUID;
 // TODO(crbug.com/1075709): remove after launch.