General cleanup on AppRTC Android Demo codebase

webrtc/examples/androidapp/src/org/appspot/apprtc/util/AsyncHttpURLConnection.java

 /*
  *  Copyright 2015 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.
  */
 
@@ skipping 16 matching lines @@
   private final String method;
   private final String url;
   private final String message;
   private final AsyncHttpEvents events;
   private String contentType;
 
   /**
    * Http requests callbacks.
    */
   public interface AsyncHttpEvents {
-    public void onHttpError(String errorMessage);
-    public void onHttpComplete(String response);
+    void onHttpError(String errorMessage);
+    void onHttpComplete(String response);
   }
 
   public AsyncHttpURLConnection(String method, String url, String message,
       AsyncHttpEvents events) {
     this.method = method;
     this.url = url;
     this.message = message;
     this.events = events;
   }
 
@@ skipping 64 matching lines @@
           + e.getMessage());
     }
   }
 
   // Return the contents of an InputStream as a String.
   private static String drainStream(InputStream in) {
     Scanner s = new Scanner(in).useDelimiter("\\A");
     return s.hasNext() ? s.next() : "";
   }
 }