Fix a lot of support links.

chrome/common/extensions/docs/templates/intros/webNavigation.html

 <h2 id="manifest">Manifest</h2>
 <p>
 All <code>chrome.webNavigation</code> methods and events require you to declare
 the "webNavigation" permission in the <a href="manifest">extension
 manifest</a>.
 For example:
 </p>
 
 <pre data-filename="manifest.json">
 {
@@ skipping 42 matching lines @@
 time after <code>onDOMContentLoaded</code>, even after
 <code>onCompleted</code>.
 </p>
 <p>
 If the history API is used to modify the state of a frame (e.g. using
 <code>history.pushState()</code>, a <code>onHistoryStateUpdated</code> event is
 fired. This event can fire any time after <code>onDOMContentLoaded</code>.
 </p>
 <p>
 If a navigation was triggered via <a
-href="https://support.google.com/chrome/bin/answer.py?answer=177873">Chrome
+href="https://support.google.com/chrome/answer/177873">Chrome
 Instant</a> or <a
-href="https://support.google.com/chrome/bin/answer.py?answer=1385029">Instant
+href="https://support.google.com/chrome/answer/1385029">Instant
 Pages</a>, a completely loaded page is swapped into the current tab. In that
 case, an <code>onTabReplaced</code> event is fired.
 </p>
 
 <h2 id="relation_to_webRequest">Relation to webRequest events</h2>
 <p>
 There is no defined ordering between events of the <a
 href="webRequest">webRequest API</a> and the events of the
 webNavigation API. It is possible that webRequest events are still received for
 frames that already started a new navigation, or that a navigation only
@@ skipping 87 matching lines @@
     The user used the Forward or Back button to initiate the navigation.
   </td>
 </tr>
 <tr>
   <td>"from_address_bar"</td>
   <td>
     The user initiated the navigation from the address bar (aka Omnibox).
   </td>
 </tr>
 </table>