Remove focus highlight

Bug: 162026203
Test: manual
Change-Id: I67447250e31e4539fc17181c497baa764eba344c
diff --git a/RotaryPlayground/res/drawable/seek_bar_background.xml b/RotaryPlayground/res/drawable/seek_bar_background.xml
deleted file mode 100644
index 8d66a3b..0000000
--- a/RotaryPlayground/res/drawable/seek_bar_background.xml
+++ /dev/null
@@ -1,20 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-  ~ Copyright (C) 2020 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.
-  -->
-
-<ripple xmlns:android="http://schemas.android.com/apk/res/android"
-        android:color="@color/car_ui_rotary_focus_color"
-        android:radius="16dp" />
diff --git a/RotaryPlayground/res/layout/rotary_direct_manipulation.xml b/RotaryPlayground/res/layout/rotary_direct_manipulation.xml
index 6f6990e..a38cbe0 100644
--- a/RotaryPlayground/res/layout/rotary_direct_manipulation.xml
+++ b/RotaryPlayground/res/layout/rotary_direct_manipulation.xml
@@ -63,8 +63,7 @@
         <SeekBar
             android:id="@+id/seek_bar"
             android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:background="@drawable/seek_bar_background">
+            android:layout_height="wrap_content">
         </SeekBar>
         <RadialTimePickerView
             android:id="@+id/radial_time_picker"
diff --git a/RotaryPlayground/res/layout/rotary_sys_ui_direct_manipulation.xml b/RotaryPlayground/res/layout/rotary_sys_ui_direct_manipulation.xml
index 9e30a1d..37782f9 100644
--- a/RotaryPlayground/res/layout/rotary_sys_ui_direct_manipulation.xml
+++ b/RotaryPlayground/res/layout/rotary_sys_ui_direct_manipulation.xml
@@ -46,8 +46,7 @@
         <SeekBar
             android:id="@+id/direct_manipulation_supported_seek_bar"
             android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:background="@drawable/seek_bar_background">
+            android:layout_height="wrap_content">
         </SeekBar>
         <RadialTimePickerView
             android:id="@+id/direct_manipulation_supported_radial_time_picker"
@@ -72,8 +71,7 @@
         <SeekBar
             android:id="@+id/direct_manipulation_unsupported_seek_bar"
             android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:background="@drawable/seek_bar_background">
+            android:layout_height="wrap_content">
         </SeekBar>
         <RadialTimePickerView
             android:id="@+id/direct_manipulation_unsupported_radial_time_picker"