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

chrome/browser/resources/extensions_infobar_mac.css

Index: chrome/browser/resources/extensions_infobar_mac.css
diff --git a/chrome/browser/resources/extensions_infobar_mac.css b/chrome/browser/resources/extensions_infobar_mac.css
index 6ce98f370c7ec6bb902ba0b568c94cc060436e1f..bf8c51214d4fa1ad88970273529e63232905814a 100644
--- a/chrome/browser/resources/extensions_infobar_mac.css
+++ b/chrome/browser/resources/extensions_infobar_mac.css
@@ -1,12 +1,16 @@
+/* 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. */
+
 /**
  * The following style rules affect Extension Infobars on the Mac.
  */
 
 body {
-  background: -webkit-linear-gradient(#EBEBEB, #CFCFCF);
+  background: -webkit-linear-gradient(#ebebeb, #cfcfcf);
   font-family: 'Lucida Grande', Helvetica, sans-serif;
   font-size: 12px;
-  height: 36px; /* Infobars are limited to 36-72px */
+  height: 36px;  /* Infobars are limited to 36-72px */
   margin: 0 38px;
   overflow: hidden;
 }