Move chat viewer option menu creation to fragment.

src/com/xabber/android/ui/adapter/ChatViewerAdapter.java

@@ -18,6 +18,7 @@ import java.util.ArrayList;
 import java.util.Collection;
 
 import android.support.v4.app.FragmentActivity;
+import android.view.Menu;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.BaseAdapter;
@@ -120,6 +121,13 @@ public class ChatViewerAdapter extends BaseAdapter implements SaveStateAdapter,
 		((ChatViewerFragment) view.getTag()).onChatChange(incomingMessage);
 	}
 
+	/**
+	 * Must be called on changes in chat (message sent, received, etc.).
+	 */
+	public void onPrepareOptionsMenu(View view, Menu menu) {
+		((ChatViewerFragment) view.getTag()).onPrepareOptionsMenu(menu);
+	}
+
 	@Override
 	public void onChange() {
 		activeChats = new ArrayList<AbstractChat>(MessageManager.getInstance()