[WebUI] Fix rest of CSS style nits so I can turn on CSS checker.

chrome/browser/resources/tracing/timeline.css

-/*
- * Copyright (c) 2012 The Chromium Authors. All rights reserved.
+/* 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 #000060
+  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);
+  box-shadow: 0 0 .05em rgba(0, 0, 0, 0.4);
+  color: rgba(0, 0, 0, 1);
 }
 
 .timeline-track-close-button {
-  left: 0px;
+  left: 0;
   position: absolute;
-  top: 0px;
+  top: 0;
 }
 
 .timeline-track-collapse-button {
   left: 15px;
   position: absolute;
-  top: 0px;
+  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;
-  -webkit-box-align: stretch;
   background-color: white;
   display: -webkit-box;
   margin: 0;
-  padding: 0;
-  padding-right: 5px;
+  padding: 0 5px 0 0;
 }
 
 .timeline-canvas-based-track-title {
   overflow: hidden;
   padding-right: 5px;
   text-align: right;
   text-overflow: ellipsis;
   white-space: nowrap;
 }
 
@@ skipping 14 matching lines @@
 }
 
 .timeline-slice-track {
   height: 18px;
 }
 
 .timeline-counter-track {
   height: 30px;
   position: relative;
 }