Messaging: Use ActivityResultContracts for media and contacts

Instead of handling showing and picking the media ourselves,
use existing AcitivityResultContracts to pick images, videos
or contacts

Change-Id: I20079ad94882cc6bbfeae8d57ca0e4aa30612c01

src/com/android/messaging/ui/mediapicker/MediaChooser.java

@@ -18,7 +18,6 @@
 package com.android.messaging.ui.mediapicker;
 
 import android.content.Context;
-import android.content.Intent;
 import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuInflater;
@@ -197,9 +196,6 @@ abstract class MediaChooser extends BasePagerViewHolder
     public void stopTouchHandling() {
     }
 
-    protected void onActivityResult(
-            final int requestCode, final int resultCode, final Intent data) {}
-
     @Override
     public int getConversationSelfSubId() {
         return mMediaPicker.getConversationSelfSubId();