Moving the iOS directory to be remoting top level.

remoting/client/ios/host_preferences_persistence_chromium.mm

-// Copyright 2017 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.
-
-#import "remoting/client/ios/host_preferences_persistence.h"
-
-#import "base/logging.h"
-
-namespace remoting {
-namespace ios {
-
-// TODO(nicholss): It might be useful to save |data| in a static variable,
-// which is then returned from ReadHostPreferencesFromKeychain(). This would
-// allow to test pairing, even though the pairing info is not persisted when
-// the app is restarted.
-
-NSError* WriteHostPreferencesToKeychain(NSData* data) {
-  NOTIMPLEMENTED();
-  return nil;
-}
-
-NSData* ReadHostPreferencesFromKeychain() {
-  NOTIMPLEMENTED();
-  return nil;
-}
-
-}  // namespace ios
-}  // namespace remoting