Revert of Allow custom metrics implementations on Android.

webrtc/api/android/java/src/org/webrtc/Camera1Session.java

 /*
  *  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.
  */
 
 package org.webrtc;
 
 import android.content.Context;
 import android.os.Handler;
 import android.os.SystemClock;
 import android.view.Surface;
 import android.view.WindowManager;
 import java.io.IOException;
 import java.nio.ByteBuffer;
 import java.util.List;
 import java.util.concurrent.TimeUnit;
 import org.webrtc.CameraEnumerationAndroid.CaptureFormat;
+import org.webrtc.Metrics.Histogram;
 
 @SuppressWarnings("deprecation")
 public class Camera1Session implements CameraSession {
   private static final String TAG = "Camera1Session";
   private static final int NUMBER_OF_CAPTURE_BUFFERS = 3;
 
   private static final Histogram camera1StartTimeMsHistogram =
       Histogram.createCounts("WebRTC.Android.Camera1.StartTimeMs", 1, 10000, 50);
   private static final Histogram camera1StopTimeMsHistogram =
       Histogram.createCounts("WebRTC.Android.Camera1.StopTimeMs", 1, 10000, 50);
@@ skipping 301 matching lines @@
     }
     return (info.orientation + rotation) % 360;
   }
 
   private void checkIsOnCameraThread() {
     if (Thread.currentThread() != cameraThreadHandler.getLooper().getThread()) {
       throw new IllegalStateException("Wrong thread");
     }
   }
 }