Fix uses of /deep/ in trace viewer.

tracing/tracing/ui/base/list_and_associated_view.css

Index: tracing/tracing/ui/base/list_and_associated_view.css
diff --git a/tracing/tracing/ui/base/list_and_associated_view.css b/tracing/tracing/ui/base/list_and_associated_view.css
deleted file mode 100644
index 6c22d5a593663e67a4788131e43c56647464faeb..0000000000000000000000000000000000000000
--- a/tracing/tracing/ui/base/list_and_associated_view.css
+++ /dev/null
@@ -1,17 +0,0 @@
-/* Copyright (c) 2012 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.
- */
-
-* /deep/ x-list-and-associated-view {
-  flex-direction: row;
-  display: flex;
-}
-
-* /deep/ x-list-and-associated-view > .x-list-view {
-  min-width: 100px;
-}
-
-* /deep/ x-list-and-associated-view > :nth-child(2) {
-  flex: 1;
-}