Revert "Android: Generate JNI code for stats"

This reverts commit aede67a199ae0552074bfec4bb03cc9a6a5fba0f.

Reason for revert: Causes error:
JNI ERROR (app bug): local reference table overflow (max=512)'

Original change's description:
> Android: Generate JNI code for stats
> 
> This CL also unifies the functions for converting from C++ to Java, and
> generates the boiler plate for converting C++ vectors to Java arrays.
> 
> Bug: webrtc:8278
> Change-Id: I262e9162beae8a64ba0e8b6a27e1081207b03961
> Reviewed-on: https://webrtc-review.googlesource.com/26020
> Commit-Queue: Magnus Jedvert <magjed@webrtc.org>
> Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#20918}

TBR=magjed@webrtc.org,sakal@webrtc.org

Change-Id: Ieb26ed8577bd489a4dd4f7542d16a7d0e11f409f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:8278
Reviewed-on: https://webrtc-review.googlesource.com/26900
Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
Commit-Queue: Magnus Jedvert <magjed@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20926}
diff --git a/sdk/android/api/org/webrtc/IceCandidate.java b/sdk/android/api/org/webrtc/IceCandidate.java
index eebc9d9..51865e9 100644
--- a/sdk/android/api/org/webrtc/IceCandidate.java
+++ b/sdk/android/api/org/webrtc/IceCandidate.java
@@ -49,4 +49,9 @@
   String getSdp() {
     return sdp;
   }
+
+  @CalledByNative
+  static IceCandidate[] createArray(int size) {
+    return new IceCandidate[size];
+  }
 }
diff --git a/sdk/android/api/org/webrtc/StatsObserver.java b/sdk/android/api/org/webrtc/StatsObserver.java
index b9984c1..b1ad0de 100644
--- a/sdk/android/api/org/webrtc/StatsObserver.java
+++ b/sdk/android/api/org/webrtc/StatsObserver.java
@@ -13,5 +13,5 @@
 /** Interface for observing Stats reports (see webrtc::StatsObservers). */
 public interface StatsObserver {
   /** Called when the reports are ready.*/
-  @CalledByNative public void onComplete(StatsReport[] reports);
+  public void onComplete(StatsReport[] reports);
 }
diff --git a/sdk/android/api/org/webrtc/StatsReport.java b/sdk/android/api/org/webrtc/StatsReport.java
index b8f1cf8..b5396fc 100644
--- a/sdk/android/api/org/webrtc/StatsReport.java
+++ b/sdk/android/api/org/webrtc/StatsReport.java
@@ -17,7 +17,6 @@
     public final String name;
     public final String value;
 
-    @CalledByNative("Value")
     public Value(String name, String value) {
       this.name = name;
       this.value = value;
@@ -37,7 +36,6 @@
   public final double timestamp;
   public final Value[] values;
 
-  @CalledByNative
   public StatsReport(String id, String type, double timestamp, Value[] values) {
     this.id = id;
     this.type = type;