Do not explicitly delete OpenGL shaders in VideoRendererGui.

talk/app/webrtc/java/android/org/webrtc/VideoRendererGui.java

 /*
  * libjingle
  * Copyright 2014 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 442 matching lines @@
   public static synchronized void dispose() {
     if (instance == null){
       return;
     }
     Log.d(TAG, "VideoRendererGui.dispose");
     synchronized (instance.yuvImageRenderers) {
       for (YuvImageRenderer yuvImageRenderer : instance.yuvImageRenderers) {
         yuvImageRenderer.release();
       }
       instance.yuvImageRenderers.clear();
-      if (instance.drawer != null) {
-        instance.drawer.release();
-      }
     }
     instance.surface = null;
     eglContext = null;
     eglContextReady = null;
     instance = null;
   }
 
   /**
    * Creates VideoRenderer with top left corner at (x, y) and resolution
    * (width, height). All parameters are in percentage of screen resolution.
@@ skipping 159 matching lines @@
     GLES20.glViewport(0, 0, screenWidth, screenHeight);
     GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
     synchronized (yuvImageRenderers) {
       for (YuvImageRenderer yuvImageRenderer : yuvImageRenderers) {
         yuvImageRenderer.draw(drawer);
       }
     }
   }
 
 }