Make all quota-exceeding messages in the storage API explain what the failure

chrome/common/extensions/docs/css/ApiRefStyles.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.
+ */
+
 .todo, .comment { /* while we're working on doc, comment out display */
   color: rgb(255, 0, 0);
   display: none;
 }
 
 .displayModeWarning {
   background-color: #FF7735; /* Aaron's favorite color */
   color: white;
   font-weight: bold;
   padding: 6px 8px;
@@ skipping 314 matching lines @@
   padding:.2em .5em .2em .9em
 }
 
 div#toc {
   background-color: rgb(232, 237, 235);
   display: inline;
   float: right;
   margin: 5px 0px 5px 20px;
   padding: 5px;
   width: 250px;
+  word-break: break-all;
 }
 
 #toc p {
   font-weight: bold;
   margin: 0px;
 }
 
 #toc ol {
   margin:1em 0 0 0;
   padding:0;
@@ skipping 1104 matching lines @@
   border: 1px solid #D9D9D9;
   border-radius: 1px;
   border-top: 1px solid silver;
   height: 27px;
   padding: 0 0 0 8px;
   -moz-border-radius: 1px;
   -webkit-border-radius: 1px;
   margin: 0 6px 0 0;
   font-size: 13px;
 }