Delete unused feed drawables.

Discovered these via:
https://bugs.chromium.org/p/chromium/issues/detail?id=636448#c24

PiperOrigin-RevId: 260206462
Change-Id: I4a4e63ec424e865aeaba9876c28c9775b4c823f6
diff --git a/src/main/java/com/google/android/libraries/feed/sharedstream/ui/res/drawable-v21/feed_text_ripple_drawable.xml b/src/main/java/com/google/android/libraries/feed/sharedstream/ui/res/drawable-v21/feed_text_ripple_drawable.xml
deleted file mode 100644
index e1315ed..0000000
--- a/src/main/java/com/google/android/libraries/feed/sharedstream/ui/res/drawable-v21/feed_text_ripple_drawable.xml
+++ /dev/null
@@ -1,27 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-  Copyright 2018 The Feed Authors.
-
-  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="?feedMoreButtonRipple">
-  <!-- Mask shape, not actually rendered. This just keeps the ripple inside the module. -->
-  <item android:id="@android:id/mask">
-    <shape>
-      <solid android:color="?feedTouchNonPressed"/>
-      <corners android:radius="@dimen/button_compat_radius"/>
-    </shape>
-  </item>
-
-</ripple>
diff --git a/src/main/java/com/google/android/libraries/feed/sharedstream/ui/res/drawable/feed_button_borderless_compat_shape.xml b/src/main/java/com/google/android/libraries/feed/sharedstream/ui/res/drawable/feed_button_borderless_compat_shape.xml
deleted file mode 100644
index fb43ae7..0000000
--- a/src/main/java/com/google/android/libraries/feed/sharedstream/ui/res/drawable/feed_button_borderless_compat_shape.xml
+++ /dev/null
@@ -1,20 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-  Copyright 2018 The Feed Authors.
-
-  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.
--->
-<shape xmlns:android="http://schemas.android.com/apk/res/android">
-  <solid android:color="@android:color/transparent"/>
-  <corners android:radius="@dimen/button_compat_radius"/>
-</shape>
diff --git a/src/main/java/com/google/android/libraries/feed/sharedstream/ui/res/drawable/feed_button_compat_shape.xml b/src/main/java/com/google/android/libraries/feed/sharedstream/ui/res/drawable/feed_button_compat_shape.xml
deleted file mode 100644
index c2af273..0000000
--- a/src/main/java/com/google/android/libraries/feed/sharedstream/ui/res/drawable/feed_button_compat_shape.xml
+++ /dev/null
@@ -1,20 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-  Copyright 2018 The Feed Authors.
-
-  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.
--->
-<shape xmlns:android="http://schemas.android.com/apk/res/android">
-  <solid android:color="@color/button_compat_color"/>
-  <corners android:radius="@dimen/button_compat_radius"/>
-</shape>