Revert of iOS - Add iceRegatherIntervalRange.

webrtc/sdk/objc/Framework/Classes/PeerConnection/RTCIntervalRange.mm

-/*
- *  Copyright 2017 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 "RTCIntervalRange+Private.h"
-
-#include "webrtc/rtc_base/checks.h"
-
-@implementation RTCIntervalRange
-
-@synthesize min = _min;
-@synthesize max = _max;
-
-- (instancetype)init {
-  return [self initWithMin:0 max:0];
-}
-
-- (instancetype)initWithMin:(NSInteger)min
-                        max:(NSInteger)max {
-  RTC_DCHECK_LE(min, max);
-  if (self = [super init]) {
-    _min = min;
-    _max = max;
-  }
-  return self;
-}
-
-- (instancetype)initWithNativeIntervalRange:(const rtc::IntervalRange &)config {
-  return [self initWithMin:config.min() max:config.max()];
-}
-
-- (NSString *)description {
-  return [NSString stringWithFormat:@"[%ld, %ld]", (long)_min, (long)_max];
-}
-
-#pragma mark - Private
-
-- (std::unique_ptr<rtc::IntervalRange>)nativeIntervalRange {
-  std::unique_ptr<rtc::IntervalRange> nativeIntervalRange(
-      new rtc::IntervalRange((int)_min, (int)_max));
-  return nativeIntervalRange;
-}
-
-@end