Minor tweaks to the diagnostics page.

pkg/analysis_server/lib/src/status/diagnostics.dart

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 
 import 'package:analysis_server/protocol/protocol_generated.dart';
 import 'package:analysis_server/src/analysis_server.dart';
@@ skipping 42 matching lines @@
   background-color: #4078c0;
 }
 
 .masthead .masthead-logo {
   display: inline-block;
   font-size: 1.5rem;
   color: #fff;
   float: left;
 }
 
+.masthead .mega-octicon {
+  font-size: 1.5rem;
+}
+
 .masthead-nav {
   float: right;
   margin-top: .5rem;
 }
 
 .masthead-nav a:not(:last-child) {
   margin-right: 1.25rem;
 }
 
 .masthead a {
@@ skipping 502 matching lines @@
       Dart ${site.title} <span style="float:right">SDK ${_sdkVersion}</span>
     </footer>
 ''');
   }
 
   void generateHeader() {
     buf.writeln('''
     <header class="masthead">
     <div class="container">
       <span class="masthead-logo">
-      <span class="mega-octicon octicon-database"></span>
+      <span class="mega-octicon octicon-dashboard"></span>
         ${site.title} Diagnostics
       </span>
 
       <nav class="masthead-nav">
         <a href="/status" ${isNavPage ? ' class="active"' : ''}>Diagnostics</a>
         <a href="/feedback" ${isCurrentPage('/feedback') ? ' class="active"' : ''}>Feedback</a>
         <a href="https://www.dartlang.org/tools/analyzer" target="_blank">Docs</a>
         <a href="https://htmlpreview.github.io/?https://github.com/dart-lang/sdk/blob/master/pkg/analysis_server/doc/api.html" target="_blank">Spec</a>
       </nav>
     </div>
@@ skipping 532 matching lines @@
     h3('Execution domain');
     ul(ExecutionService.VALUES, (item) {
       if (domain.onFileAnalyzed != null) {
         buf.write('$item (has subscriptions)');
       } else {
         buf.write('$item (no subscriptions)');
       }
     });
   }
 }