Allow custom metrics implementations on Android.

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

Index: webrtc/api/android/java/src/org/webrtc/Metrics.java
diff --git a/webrtc/api/android/java/src/org/webrtc/Metrics.java b/webrtc/api/android/java/src/org/webrtc/Metrics.java
index 7d715fb7ae42278b243c029ca0395f0545076f88..ca19489e892466148e8cee2b5aa4eee28cc1901d 100644
--- a/webrtc/api/android/java/src/org/webrtc/Metrics.java
+++ b/webrtc/api/android/java/src/org/webrtc/Metrics.java
@@ -59,41 +59,6 @@ public class Metrics {
     }
   }
 
-  /**
-   * Class for holding the native pointer of a histogram. Since there is no way to destroy a
-   * histogram, please don't create unnecessary instances of this object. This class is thread safe.
-   *
-   * Usage example:
-   * private static final Histogram someMetricHistogram =
-   *     Histogram.createCounts("WebRTC.Video.SomeMetric", 1, 10000, 50);
-   * someMetricHistogram.addSample(someVariable);
-   */
-  static class Histogram {
-    private final long handle;
-    private final String name; // Only used for logging.
-
-    private Histogram(long handle, String name) {
-      this.handle = handle;
-      this.name = name;
-    }
-
-    static public Histogram createCounts(String name, int min, int max, int bucketCount) {
-      return new Histogram(nativeCreateCounts(name, min, max, bucketCount), name);
-    }
-
-    static public Histogram createEnumeration(String name, int max) {
-      return new Histogram(nativeCreateEnumeration(name, max), name);
-    }
-
-    public void addSample(int sample) {
-      nativeAddSample(handle, sample);
-    }
-
-    private static native long nativeCreateCounts(String name, int min, int max, int bucketCount);
-    private static native long nativeCreateEnumeration(String name, int max);
-    private static native void nativeAddSample(long handle, int sample);
-  }
-
   private void add(String name, HistogramInfo info) {
     map.put(name, info);
   }