Fix up a few more lint warnings.

- Suppress missing drawables in components/web_contents_delegate_android/
- Remove unused progress_bar.xml

BUG=266140

Review URL: https://codereview.chromium.org/971223004

Cr-Commit-Position: refs/heads/master@{#319158}

build/android/lint/suppressions.xml

@@ -43,6 +43,8 @@ Still reading?
   </issue>
   <issue id="IconDensities">
     <!-- crbug.com/457918 is tracking missing assets -->
+    <ignore path="components/web_contents_delegate_android/android/java/res/drawable-xxhdpi"/>
+    <ignore path="components/web_contents_delegate_android/android/java/res/drawable-xxxhdpi"/>
     <ignore path="content/public/android/java/res/drawable-xxhdpi"/>
     <ignore path="content/public/android/java/res/drawable-xxxhdpi"/>
     <ignore path="chrome/android/java/res/drawable-xxhdpi"/>

chrome/android/shell/res/drawable/progress_bar.xml

-<?xml version="1.0" encoding="utf-8"?>
-<!--
-     Copyright 2015 The Chromium Authors. All rights reserved.
-     Use of this source code is governed by a BSD-style license that can be
-     found in the LICENSE file.
--->
-
-<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
-    <item android:id="@android:id/secondaryProgress">
-        <clip android:gravity="left">
-            <shape>
-                <solid android:color="@color/material_deep_teal_200" />
-            </shape>
-        </clip>
-    </item>
-    <item android:id="@android:id/progress">
-        <clip android:gravity="left">
-            <shape>
-                <solid android:color="@color/material_deep_teal_500" />
-            </shape>
-        </clip>
-    </item>
-</layer-list>
\ No newline at end of file