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

chrome/browser/resources/sessions.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. */
+
 body {
   margin: 20px;
 }
 
 h1 {
   -webkit-padding-start: 75px;
   background-image: url('shared/images/history_section.png');
   background-position: left;
   background-repeat: no-repeat;
   font-size: 156%;
   font-weight: bold;
   margin: 0;
   padding-bottom: 20px;
   padding-top: 20px;
 }
 
 html[dir=rtl] h1 {
   background-position: right;
 }
 
 #magic-summary {
-  background-color: #ebeff9;
-  border-top: 1px solid #9cc2ef;
+  background-color: rgb(235, 239, 249);
+  border-top: 1px solid rgb(156, 194, 239);
   margin-bottom: 6px;
   margin-top: 12px;
   padding: 3px;
 }
 
 #magic-summary-text {
   font-weight: bold;
 }
 
 #sessions-summary {
-  background-color: #ebeff9;
-  border-top: 1px solid #9cc2ef;
+  background-color: rgb(235, 239, 249);
+  border-top: 1px solid rgb(156, 194, 239);
   margin-bottom: 6px;
   margin-top: 12px;
   padding: 3px;
 }
 
 #sessions-summary-text {
   font-weight: bold;
 }
 
 #session-list h3 {
@@ skipping 23 matching lines @@
 .indent {
   margin: 4px;
   padding-left: 16px;
 }
 
 .expandable {
   cursor: pointer;
   font-size: 16px;
 }