Remove exo_legacy_player_view.xml from media3

This is only used by LegacyPlayerView which was removed in
https://github.com/androidx/media/commit/6aa1816bd390b735fb855409cbdc6772b6e6fec3

PiperOrigin-RevId: 437018966

libraries/ui/src/main/res/layout/exo_legacy_player_view.xml

-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (C) 2016 The Android Open Source Project
-
-     Licensed under the Apache License, Version 2.0 (the "License");
-     you may not use this file except in compliance with the License.
-     You may obtain a copy of the License at
-
-          http://www.apache.org/licenses/LICENSE-2.0
-
-     Unless required by applicable law or agreed to in writing, software
-     distributed under the License is distributed on an "AS IS" BASIS,
-     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-     See the License for the specific language governing permissions and
-     limitations under the License.
--->
-<merge xmlns:android="http://schemas.android.com/apk/res/android">
-
-  <androidx.media3.ui.AspectRatioFrameLayout android:id="@id/exo_content_frame"
-      android:layout_width="match_parent"
-      android:layout_height="match_parent"
-      android:layout_gravity="center">
-
-    <!-- Video surface will be inserted as the first child of the content frame. -->
-
-    <View android:id="@id/exo_shutter"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:background="@android:color/black"/>
-
-    <ImageView android:id="@id/exo_artwork"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:scaleType="fitXY"/>
-
-    <androidx.media3.ui.SubtitleView android:id="@id/exo_subtitles"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"/>
-
-    <ProgressBar android:id="@id/exo_buffering"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:indeterminate="true"
-        android:layout_gravity="center"/>
-
-    <TextView android:id="@id/exo_error_message"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:layout_gravity="center"
-        android:gravity="center"
-        android:background="@color/exo_error_message_background_color"
-        android:padding="16dp"/>
-
-  </androidx.media3.ui.AspectRatioFrameLayout>
-
-  <FrameLayout android:id="@id/exo_ad_overlay"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"/>
-
-  <FrameLayout android:id="@id/exo_overlay"
-      android:layout_width="match_parent"
-      android:layout_height="match_parent"/>
-
-  <View android:id="@id/exo_controller_placeholder"
-      android:layout_width="match_parent"
-      android:layout_height="match_parent"/>
-
-</merge>