Remove old tracing code now that it has moved to third_party.

chrome/browser/resources/tracing/profiling_view.css

-/* 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. */
-
-.profiling-view {
-  -webkit-box-flex: 1;
-  -webkit-box-orient: vertical;
-  display: -webkit-box;
-  padding: 0;
-}
-
-.profiling-view > .container {
-  -webkit-box-flex: 1;
-  display: -webkit-box;
-}
-
-.profiling-overlay {
-  -webkit-box-orient: vertical;
-  display: -webkit-box;
-  text-align: center;
-}
-
-.profiling-overlay .raw-text {
-  -webkit-box-flex: 1;
-  overflow: auto;
-  wrap: none;
-}
-
-.profiling-overlay .error {
-  border: 1px solid red;
-  text-align: center;
-}