Release camera statistics after switching camera on CameraCapturer.

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

Index: webrtc/api/android/java/src/org/webrtc/CameraCapturer.java
diff --git a/webrtc/api/android/java/src/org/webrtc/CameraCapturer.java b/webrtc/api/android/java/src/org/webrtc/CameraCapturer.java
index be57a9bd7fd4e91c4147ac0c6cafdb84dfdf807c..f662b38a598d4e1efa3e26a4abeccd8b95f93c30 100644
--- a/webrtc/api/android/java/src/org/webrtc/CameraCapturer.java
+++ b/webrtc/api/android/java/src/org/webrtc/CameraCapturer.java
@@ -396,6 +396,8 @@ public abstract class CameraCapturer implements CameraVideoCapturer {
       }
 
       Logging.d(TAG, "switchCamera: Stopping session");
+      cameraStatistics.release();
+      cameraStatistics = null;
       currentSession.stop();
       currentSession = null;