Rename media constraints model and store.

webrtc/examples/objc/AppRTCMobile/ios/ARDMediaConstraintsSettingsStore.h

-/*
- *  Copyright 2016 The WebRTC Project Authors. All rights reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#import <Foundation/Foundation.h>
-
-NS_ASSUME_NONNULL_BEGIN
-
-/**
- * Light-weight persistent store for media constraints user settings.
- *
- * It will persist between application launches and application updates.
- */
-@interface ARDMediaConstraintsSettingsStore : NSObject
-
-/**
- * Returns current video resolution media constraint string stored in the store.
- */
-- (nullable NSString *)videoResolutionConstraintsSetting;
-
-/**
- * Stores the provided value as video resolution media constraint.
- * @param value the string to be stored
- */
-- (void)setVideoResolutionConstraintsSetting:(NSString *)value;
-
-@end
-NS_ASSUME_NONNULL_END