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

chrome/browser/resources/tracing/timeline.css

Index: chrome/browser/resources/tracing/timeline.css
diff --git a/chrome/browser/resources/tracing/timeline.css b/chrome/browser/resources/tracing/timeline.css
deleted file mode 100644
index a7c7de1171f633701b5a8d4d693792ada2052745..0000000000000000000000000000000000000000
--- a/chrome/browser/resources/tracing/timeline.css
+++ /dev/null
@@ -1,98 +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. */
-
-.timeline * {
-  -webkit-user-select: none;
-  cursor: default;
-}
-
-.timeline-drag-box {
-  background-color: rgba(0, 0, 255, 0.25);
-  border: 1px solid rgb(0, 0, 96);
-  font-size: 75%;
-  position: fixed;
-}
-
-.timeline-thread-track {
-  -webkit-box-orient: vertical;
-  display: -webkit-box;
-  padding: 1px 0;
-  position: relative;
-}
-
-.timeline-track-button {
-  background-color: rgba(255, 255, 255, 0.5);
-  border: 1px solid rgba(0, 0, 0, 0.1);
-  color: rgba(0,0,0,0.2);
-  font-size: 10px;
-  height: 12px;
-  text-align: center;
-  width: 12px;
-}
-
-.timeline-track-button:hover {
-  background-color: rgba(255, 255, 255, 1.0);
-  border: 1px solid rgba(0, 0, 0, 0.5);
-  border-radius: 25%;
-  box-shadow: 0 0 .05em rgba(0, 0, 0, 0.4);
-  color: rgba(0, 0, 0, 1);
-}
-
-.timeline-track-close-button {
-  left: 0;
-  position: absolute;
-  top: 0;
-}
-
-.timeline-track-collapse-button {
-  left: 15px;
-  position: absolute;
-  top: 0;
-}
-
-.timeline-thread-track:not(:first-child) {
-  border-top: 1px solid #D0D0D0;
-}
-
-.timeline-canvas-based-track {
-  -webkit-box-align: stretch;
-  -webkit-box-orient: horizontal;
-  background-color: white;
-  display: -webkit-box;
-  margin: 0;
-  padding: 0 5px 0 0;
-}
-
-.timeline-canvas-based-track-title {
-  overflow: hidden;
-  padding-right: 5px;
-  text-align: right;
-  text-overflow: ellipsis;
-  white-space: nowrap;
-}
-
-.timeline-canvas-based-track-canvas-container {
-  -webkit-box-flex: 1;
-  width: 100%;
-}
-
-.timeline-canvas-based-track-canvas {
-  -webkit-box-flex: 1;
-  display: block;
-  height: 100%;
-  width: 100%;
-}
-
-.timeline-viewport-track {
-  height: 12px;
-}
-
-.timeline-slice-track {
-  height: 18px;
-}
-
-.timeline-counter-track {
-  height: 30px;
-  position: relative;
-}