Revert of Allow custom metrics implementations on Android.

webrtc/api/android/jni/androidhistogram_jni.cc

-/*
- *  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.
- */
-
-#include <map>
-#include <memory>
-
-#include "webrtc/api/android/jni/classreferenceholder.h"
-#include "webrtc/api/android/jni/jni_helpers.h"
-#include "webrtc/api/android/jni/native_handle_impl.h"
-#include "webrtc/system_wrappers/include/metrics.h"
-
-// Enables collection of native histograms and creating them.
-namespace webrtc_jni {
-
-JOW(jlong, Histogram_nativeCreateCounts)
-(JNIEnv* jni, jclass, jstring j_name, jint min, jint max, jint buckets) {
-  std::string name = JavaToStdString(jni, j_name);
-  return jlongFromPointer(
-      webrtc::metrics::HistogramFactoryGetCounts(name, min, max, buckets));
-}
-
-JOW(jlong, Histogram_nativeCreateEnumeration)
-(JNIEnv* jni, jclass, jstring j_name, jint max) {
-  std::string name = JavaToStdString(jni, j_name);
-  return jlongFromPointer(
-      webrtc::metrics::HistogramFactoryGetEnumeration(name, max));
-}
-
-JOW(void, Histogram_nativeAddSample)
-(JNIEnv* jni, jclass, jlong histogram, jint sample) {
-  if (histogram) {
-    HistogramAdd(reinterpret_cast<webrtc::metrics::Histogram*>(histogram),
-                 sample);
-  }
-}
-
-}  // namespace webrtc_jni