Revert of Split iOS sdk in to separate targets

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

-/*
- *  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 "WebRTC/RTCMetrics.h"
-
-#import "RTCMetricsSampleInfo+Private.h"
-
-void RTCEnableMetrics() {
-  webrtc::metrics::Enable();
-}
-
-NSArray<RTCMetricsSampleInfo *> *RTCGetAndResetMetrics() {
-  std::map<std::string, std::unique_ptr<webrtc::metrics::SampleInfo>>
-      histograms;
-  webrtc::metrics::GetAndReset(&histograms);
-
-  NSMutableArray *metrics =
-      [NSMutableArray arrayWithCapacity:histograms.size()];
-  for (auto const &histogram : histograms) {
-    RTCMetricsSampleInfo *metric = [[RTCMetricsSampleInfo alloc]
-        initWithNativeSampleInfo:*histogram.second];
-    [metrics addObject:metric];
-  }
-  return metrics;
-}