[Sync] Move //sync to //components/sync.

sync/engine/conflict_resolver.h

-// 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.
-//
-// A class that watches the syncer and attempts to resolve any conflicts that
-// occur.
-
-#ifndef SYNC_ENGINE_CONFLICT_RESOLVER_H_
-#define SYNC_ENGINE_CONFLICT_RESOLVER_H_
-
-#include <set>
-
-#include "base/gtest_prod_util.h"
-#include "base/macros.h"
-#include "sync/engine/syncer_types.h"
-
-namespace syncer {
-
-namespace syncable {
-class Id;
-class WriteTransaction;
-}  // namespace syncable
-
-class Cryptographer;
-struct UpdateCounters;
-
-namespace sessions {
-class StatusController;
-}  // namespace sessions
-
-class ConflictResolver {
- public:
-  // Enumeration of different conflict resolutions. Used for histogramming.
-  enum SimpleConflictResolutions {
-    OVERWRITE_LOCAL,           // Resolved by overwriting local changes.
-    OVERWRITE_SERVER,          // Resolved by overwriting server changes.
-    UNDELETE,                  // Resolved by undeleting local item.
-    IGNORE_ENCRYPTION,         // Resolved by ignoring an encryption-only server
-                               // change.
-    NIGORI_MERGE,              // Resolved by merging nigori nodes.
-    CHANGES_MATCH,             // Resolved by ignoring both local and server
-                               // changes because they matched.
-    CONFLICT_RESOLUTION_SIZE,
-  };
-
-  ConflictResolver();
-  ~ConflictResolver();
-  // Called by the syncer at the end of a update/commit cycle.
-  // Returns true if the syncer should try to apply its updates again.
-  void ResolveConflicts(syncable::WriteTransaction* trans,
-                        const Cryptographer* cryptographer,
-                        const std::set<syncable::Id>& simple_conflict_ids,
-                        sessions::StatusController* status,
-                        UpdateCounters* counters);
-
- private:
-  friend class SyncerTest;
-  FRIEND_TEST_ALL_PREFIXES(SyncerTest,
-                           ConflictResolverMergeOverwritesLocalEntry);
-
-  void ProcessSimpleConflict(
-      syncable::WriteTransaction* trans,
-      const syncable::Id& id,
-      const Cryptographer* cryptographer,
-      sessions::StatusController* status,
-      UpdateCounters* counters);
-
-  DISALLOW_COPY_AND_ASSIGN(ConflictResolver);
-};
-
-}  // namespace syncer
-
-#endif  // SYNC_ENGINE_CONFLICT_RESOLVER_H_