Cleanup: Don't close single tags.

chrome/browser/resources/net_internals/hsts_view.html

 <!-- HSTS tab -->
 <div id=hsts-view-tab-content class=content-box>
   <p>
     HSTS is HTTPS Strict Transport Security: a way for sites to elect to
     always use HTTPS. See <a href="http://dev.chromium.org/sts" target=_blank>
     http://dev.chromium.org/sts</a>.</p>
 
     <!-- This UI allows a user to query and update the browser's list of
          HSTS domains. -->
 
   <h4>Add domain</h4>
 
   <p>Input a domain name to add it to the HSTS set:</p>
   <form id=hsts-view-add-form>
     Domain: <input type=text id=hsts-view-add-input type="url"
-             placeholder="example.com"/><br/>
-    Include subdomains: <input type="checkbox" id=hsts-view-check-input /><br/>
-    Public key fingerprints: <input type=text id=hsts-view-add-pins style="width: 25em;"/><br/>
+             placeholder="example.com"><br>
+    Include subdomains: <input type="checkbox" id=hsts-view-check-input><br>
+    Public key fingerprints: <input type=text id=hsts-view-add-pins style="width: 25em;"><br>
     <p style="font-size: small; color: gray; font-style: italic; margin-left: 2em; max-width: 40em;">(public key fingerprints are comma separated and consist of the hash function followed by a foreslash and the base64 encoded fingerprint, for example <tt>sha1/Guzek9lMwR3KeIS8wwS9gBvVtIg=</tt>)</p>
-    <input type=submit value="Add" id=hsts-view-add-submit />
+    <input type=submit value="Add" id=hsts-view-add-submit>
   </form>
 
   <h4>Delete domain</h4>
 
   <p>
     Input a domain name to delete it from the HSTS set
     (<i>you cannot delete preloaded entries</i>):
   </p>
   <form id=hsts-view-delete-form>
     Domain: <input type=text id=hsts-view-delete-input type="url"
-             placeholder="example.com"/>
-    <input type=submit value="Delete" id=hsts-view-delete-submit />
+             placeholder="example.com">
+    <input type=submit value="Delete" id=hsts-view-delete-submit>
   </form>
 
   <h4>Query domain</h4>
 
   <p>Input a domain name to query the current HSTS set:</p>
   <form id=hsts-view-query-form>
     Domain: <input type=text id=hsts-view-query-input type="url"
-             placeholder="example.com"/>
-    <input type=submit value="Query" id=hsts-view-query-submit />
+             placeholder="example.com">
+    <input type=submit value="Query" id=hsts-view-query-submit>
   </form>
   <div style="margin-top: 1em; margin-left: 2em;" id=hsts-view-query-output></div>
 </div>