VideoCapturerAndroid: Remove unused function getCameraThreadHandler

R=sakal@webrtc.org

Review URL: https://codereview.webrtc.org/2107803002 .

Cr-Commit-Position: refs/heads/master@{#13319}

webrtc/api/java/android/org/webrtc/VideoCapturerAndroid.java

@@ -577,11 +577,6 @@ public class VideoCapturerAndroid implements
     frameObserver.onOutputFormatRequest(width, height, framerate);
   }
 
-  // Exposed for testing purposes only.
-  Handler getCameraThreadHandler() {
-    return cameraThreadHandler;
-  }
-
   private int getDeviceOrientation() {
     int orientation = 0;