Fix uses of /deep/ in trace viewer.

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

Index: tracing/tracing/ui/extras/chrome/cc/picture_ops_chart_view.css
diff --git a/tracing/tracing/ui/extras/chrome/cc/picture_ops_chart_view.css b/tracing/tracing/ui/extras/chrome/cc/picture_ops_chart_view.css
deleted file mode 100644
index 5f1943e5c794d5880a3cbeb17c1bd2f7b22eeb61..0000000000000000000000000000000000000000
--- a/tracing/tracing/ui/extras/chrome/cc/picture_ops_chart_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-picture-ops-chart-view {
-  display: block;
-  height: 180px;
-  margin: 0;
-  padding: 0;
-  position: relative;
-}
-
-* /deep/ tr-ui-e-chrome-cc-picture-ops-chart-view > .use-percentile-scale {
-  left: 0;
-  position: absolute;
-  top: 0;
-}