[Sync] Rename syncable_prefs to sync_preferences.

ios/chrome/browser/browser_state/off_the_record_chrome_browser_state_impl.h

 // 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.
 
 #ifndef IOS_CHROME_BROWSER_BROWSER_STATE_OFF_THE_RECORD_CHROME_BROWSER_STATE_IMPL_H_
 #define IOS_CHROME_BROWSER_BROWSER_STATE_OFF_THE_RECORD_CHROME_BROWSER_STATE_IMPL_H_
 
 #include "base/macros.h"
 #include "ios/chrome/browser/browser_state/chrome_browser_state.h"
 #include "ios/chrome/browser/browser_state/off_the_record_chrome_browser_state_io_data.h"
 
-namespace syncable_prefs {
+namespace sync_preferences {
 class PrefServiceSyncable;
 }
 
 // The implementation of ChromeBrowserState that is used for incognito browsing.
 // Each OffTheRecordChromeBrowserStateImpl instance is associated with and owned
 // by a non-incognito ChromeBrowserState instance.
 class OffTheRecordChromeBrowserStateImpl : public ios::ChromeBrowserState {
  public:
   ~OffTheRecordChromeBrowserStateImpl() override;
 
@@ skipping 25 matching lines @@
   // |original_chrome_browser_state_| is the non-incognito
   // ChromeBrowserState instance that owns this instance.
   OffTheRecordChromeBrowserStateImpl(
       ios::ChromeBrowserState* original_chrome_browser_state,
       const base::FilePath& otr_path);
 
   base::FilePath otr_state_path_;
   ios::ChromeBrowserState* original_chrome_browser_state_;  // weak
 
   // Weak pointer owned by |original_chrome_browser_state_|.
-  syncable_prefs::PrefServiceSyncable* prefs_;
+  sync_preferences::PrefServiceSyncable* prefs_;
 
   std::unique_ptr<OffTheRecordChromeBrowserStateIOData::Handle> io_data_;
   std::unique_ptr<PrefProxyConfigTracker> pref_proxy_config_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(OffTheRecordChromeBrowserStateImpl);
 };
 
 #endif  // IOS_CHROME_BROWSER_BROWSER_STATE_OFF_THE_RECORD_CHROME_BROWSER_STATE_IMPL_H_