Move /webrtc/api/android files to /webrtc/sdk/android

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

-/*
- *  Copyright 2013 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.
- */
-
-package org.webrtc;
-
-/** Interface for observing SDP-related events. */
-public interface SdpObserver {
-  /** Called on success of Create{Offer,Answer}(). */
-  public void onCreateSuccess(SessionDescription sdp);
-
-  /** Called on success of Set{Local,Remote}Description(). */
-  public void onSetSuccess();
-
-  /** Called on error of Create{Offer,Answer}(). */
-  public void onCreateFailure(String error);
-
-  /** Called on error of Set{Local,Remote}Description(). */
-  public void onSetFailure(String error);
-}