[Sync] Rename syncable_prefs to sync_preferences.

components/syncable_prefs/pref_service_syncable_observer.h

Index: components/syncable_prefs/pref_service_syncable_observer.h
diff --git a/components/syncable_prefs/pref_service_syncable_observer.h b/components/syncable_prefs/pref_service_syncable_observer.h
deleted file mode 100644
index 92ba143a416050eb4af7f2b4ee8b037347a2dc81..0000000000000000000000000000000000000000
--- a/components/syncable_prefs/pref_service_syncable_observer.h
+++ /dev/null
@@ -1,21 +0,0 @@
-// Copyright 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.
-
-#ifndef COMPONENTS_SYNCABLE_PREFS_PREF_SERVICE_SYNCABLE_OBSERVER_H_
-#define COMPONENTS_SYNCABLE_PREFS_PREF_SERVICE_SYNCABLE_OBSERVER_H_
-
-namespace syncable_prefs {
-
-class PrefServiceSyncableObserver {
- public:
-  // Invoked when PrefService::IsSyncing() changes.
-  virtual void OnIsSyncingChanged() = 0;
-
- protected:
-  virtual ~PrefServiceSyncableObserver() {}
-};
-
-}  // namespace syncable_prefs
-
-#endif  // COMPONENTS_SYNCABLE_PREFS_PREF_SERVICE_SYNCABLE_OBSERVER_H_