MD Downloads: remove most deprecated CSS imports

chrome/browser/resources/md_downloads/manager.css

Index: chrome/browser/resources/md_downloads/manager.css
diff --git a/chrome/browser/resources/md_downloads/manager.css b/chrome/browser/resources/md_downloads/manager.css
deleted file mode 100644
index 39e49659d876dee9e8b641c1b1ec3b425ae70d7b..0000000000000000000000000000000000000000
--- a/chrome/browser/resources/md_downloads/manager.css
+++ /dev/null
@@ -1,74 +0,0 @@
-/* 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. */
-
-:host {
-  display: flex;
-  flex: 1 0;
-  flex-direction: column;
-  height: 100%;
-  z-index: 0;
-}
-
-@media screen and (max-width: 1024px) {
-  :host {
-    flex-basis: 670px;  /* 622 card width + 24 left margin + 24 right margin. */
-  }
-}
-
-#toolbar {
-  position: relative;
-  z-index: 1;
-}
-
-#toolbar::after {
-  box-shadow: inset 0 5px 6px -3px rgba(0, 0, 0, 0.4);
-  content: '';
-  display: block;
-  height: 6px;
-  opacity: 0;
-  position: absolute;
-  top: 100%;
-  transition: opacity 500ms;
-  width: 100%;
-}
-
-:host([has-shadow_]) #toolbar::after {
-  opacity: 1;
-}
-
-#downloads-list {
-  /* TODO(dbeam): we're not setting scrollTarget explicitly, yet
-   * style="overflow: auto" is still being set by <iron-list>'s JS. Weird. */
-  overflow-y: overlay !important;
-}
-
-#no-downloads,
-#downloads-list {
-  flex: 1;
-}
-
-:host([loading]) #no-downloads,
-:host([loading]) #downloads-list {
-  display: none;
-}
-
-#no-downloads {
-  align-items: center;
-  color: #b4b4b4;
-  display: flex;
-  font-size: 123.1%;
-  font-weight: 500;
-  justify-content: center;
-  /* To avoid overlapping with the header, we need this min-height
-   * until bug 596743 is fixed. */
-  min-height: min-content;
-}
-
-#no-downloads .illustration {
-  background: -webkit-image-set(
-      url(chrome://downloads/1x/no_downloads.png) 1x,
-      url(chrome://downloads/2x/no_downloads.png) 2x) no-repeat center center;
-  height: 144px;  /* Matches natural image height. */
-  margin-bottom: 32px;
-}