Rename media constraints model and store.

webrtc/examples/objc/AppRTCMobile/ios/ARDSettingsStore.m

 /*
  *  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 "ARDMediaConstraintsSettingsStore.h"
+#import "ARDSettingsStore.h"
 
 static NSString *const kUserDefaultsMediaConstraintsKey =
     @"rtc_video_resolution_media_constraints_key";
 
 NS_ASSUME_NONNULL_BEGIN
-@implementation ARDMediaConstraintsSettingsStore
+@implementation ARDSettingsStore
 
 - (nullable NSString *)videoResolutionConstraintsSetting {
   return [[NSUserDefaults standardUserDefaults] objectForKey:kUserDefaultsMediaConstraintsKey];
 }
 
 - (void)setVideoResolutionConstraintsSetting:(NSString *)constraintsString {
   [[NSUserDefaults standardUserDefaults] setObject:constraintsString
                                             forKey:kUserDefaultsMediaConstraintsKey];
 }
 
 @end
 NS_ASSUME_NONNULL_END