Fix uses of /deep/ in trace viewer.

tracing/tracing/ui/extras/chrome/cc/layer_tree_host_impl_view.css

Index: tracing/tracing/ui/extras/chrome/cc/layer_tree_host_impl_view.css
diff --git a/tracing/tracing/ui/extras/chrome/cc/layer_tree_host_impl_view.css b/tracing/tracing/ui/extras/chrome/cc/layer_tree_host_impl_view.css
deleted file mode 100644
index a1f12faf67a49df210e13bdddd62fec49822f759..0000000000000000000000000000000000000000
--- a/tracing/tracing/ui/extras/chrome/cc/layer_tree_host_impl_view.css
+++ /dev/null
@@ -1,18 +0,0 @@
-/* Copyright (c) 2013 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/ .tr-ui-e-chrome-cc-lthi-s-view {
-  flex: 1 1 auto !important;
-  flex-direction: row;
-  display: flex;
-}
-
-* /deep/ .tr-ui-e-chrome-cc-lthi-s-view > tr-ui-e-chrome-cc-layer-picker {
-  flex: 1 1 auto;
-}
-
-* /deep/ .tr-ui-e-chrome-cc-lthi-s-view > tr-ui-b-drag-handle {
-  flex: 0 0 auto;
-}