Refactor usages of Picture In Picture and Multi Window (4/4)

Bug: 27365860
Change-Id: I488fbc9fc8035fa06e6a68c117a58cc35749cc7c

samples/MultiWindow/src/com/example/android/multiwindow/CaptionOverlayActivity.java

@@ -40,7 +40,7 @@ public class CaptionOverlayActivity extends Activity
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         // Overlay the caption on the content.
-        overlayWithDecorCaption(true);
+        setOverlayWithDecorCaptionEnabled(true);
         setContentView(R.layout.caption_overlay_layout);
         getWindow().setRestrictedCaptionAreaListener(this);
         getWindow().setResizingCaptionDrawable(new ColorDrawable(Color.BLACK));