CLEANUP - remove legacy icons and old Launcher3 icon

go/AndroidManifest-launcher.xml

@@ -31,7 +31,7 @@
         android:fullBackupOnly="true"
         android:fullBackupContent="@xml/backupscheme"
         android:hardwareAccelerated="true"
-        android:icon="@drawable/ic_launcher_home"
+        android:icon="@mipmap/ic_launcher"
         android:label="@string/derived_app_name"
         android:theme="@style/AppTheme"
         android:largeHeap="@bool/config_largeHeap"

go/AndroidManifest.xml

@@ -31,7 +31,7 @@
         android:fullBackupOnly="true"
         android:fullBackupContent="@xml/backupscheme"
         android:hardwareAccelerated="true"
-        android:icon="@drawable/ic_launcher_home"
+        android:icon="@mipmap/ic_launcher"
         android:label="@string/derived_app_name"
         android:theme="@style/AppTheme"
         android:largeHeap="@bool/config_largeHeap"

res/drawable/ic_launcher_home.xml

@@ -1,21 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (C) 2017 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.
--->
-<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
-    <background android:drawable="@color/icon_background" />
-    <foreground>
-        <bitmap android:src="@mipmap/ic_launcher_home_foreground"/>
-    </foreground>
-</adaptive-icon>