Extension docs: Update whats_new.html for M21.

chrome/common/extensions/docs/server2/templates/articles/whats_new.html

 <h1>What's New in Extensions?</h1>
 <!--  -->
 
 <p>
 This page lists the API and manifest changes
 made in recent releases.
 </p>
 
 <ul>
+  <li> <a href="#21">Google Chrome 21</a> </li>
   <li> <a href="#20">Google Chrome 20</a> </li>
   <li> <a href="#19">Google Chrome 19</a> </li>
   <li> <a href="#18">Google Chrome 18</a> </li>
   <li> <a href="#17">Google Chrome 17</a> </li>
   <li> <a href="#16">Google Chrome 16</a> </li>
   <li> <a href="#15">Google Chrome 15</a> </li>
   <li> <a href="#14">Google Chrome 14</a> </li>
   <li> <a href="#13">Google Chrome 13</a> </li>
   <li> <a href="#12">Google Chrome 12</a> </li>
   <li> <a href="#11">Google Chrome 11</a> </li>
   <li> <a href="#10">Google Chrome 10</a> </li>
   <li> <a href="#9">Google Chrome 9</a> </li>
   <li> <a href="#8">Google Chrome 8</a> </li>
   <li> <a href="#7">Google Chrome 7</a> </li>
   <li> <a href="#6">Google Chrome 6</a> </li>
 </ul>
 
-<p class="note">
-  <strong>New version of packaged apps:</strong><br>
-  There's a new version of
-  <a href="http://developer.chrome.com/trunk/apps/about_apps.html">packaged apps</a>
-  in the <a href="http://dev.chromium.org/getting-involved/dev-channel?">dev channel</a>.
-</p>
+<h2 id="21"> Google Chrome 21 </h2>
 
-<p>
-In addition to the changes listed below,
-check out the
-<a href="experimental.html">experimental APIs</a>.
-</p>
+<h4> New Features </h4>
+  <ul>
+    <li>The <a href="manifest.html#sandbox">sandbox manifest entry</a> allows
+      you to define some pages within your extension that are automatically run
+      in a low-privilege sandbox. This sandbox is not bound by the
+      <a href="manifest.html#content_security_policy"
+      >content_security_policy</a>.
+    <li>The <a href="input.ime.html">IME</a> API allows extensions to implement
+      <a href="http://en.wikipedia.org/wiki/Input_method">input method
+      editors</a> on Chrome OS.
+  </ul>
+
+<h4> Additions to Existing Features </h4>
+  <ul>
+    <li>The events in the <a href="webNavigation.html">Web Navigation API</a>
+      now accept <a href="events.html#declarative">filters</a> which limit the
+      URLs they fire on.
+    <li>The <a href="types.html#method-types.ChromeSetting-set"
+      >ChromeSetting.set()</a> method now has a
+      <code>regular_only</code> scope.
+    <li>The <a href="browsingData.html#type-browsingData.RemovalOptions"
+      >browsingData.RemovalOptions</a> now has an <code>originTypes</code>
+      property.
+    <li>The <a href="management.html#method-uninstall"
+      >management.uninstall()</a> method now has a <code
+      >showConfirmDialog</code> parameter.
+    <li>The <a href="contextMenus.html#method-create"
+      >contextMenus.create()</a> method now allows you to specify unique
+      IDs for each item. This is intended to be used with the new
+      <a href="contextMenus.html#event-onClicked"
+      >contextMenus.onClicked</a> event, to distinguish the clicked item.
+    <li>The a href="browserAction.html#method-setIcon"
+      >browserAction.setIcon()</a> and
+      <a href="pageAction.html#method-setIcon"
+      >pageAction.setIcon()</a> methods now accept optional callbacks.
+    <li>The <a href="privacy.html#property-websites"
+      >privacy.website</a> namespace now has a <code
+      >protectedContentEnabled</code> property.
+    <li>The <code>index</code> parameter to the <a href="tabs.html#method-move"
+      >tabs.move()</a> method now accepts <code>-1</code> to indicate
+      that the tab should be placed at the end.
+    <li>The <code>windowId</code> parameter to the
+      <a href="tabs.html#method-highlight">tabs.highlight()</a><
+      method is now optional.
+    <li><a href="manifest.html#intents">Web intents</a> can now be used to
+      register content-type viewers.
+  </ul>
 
 <h2 id="20"> Google Chrome 20 </h2>
 
 <h4> New APIs </h4>
   <ul>
     <li>The
       <a href="storage.html">storage API</a>
       lets you store, retrieve, and
       track changes to user data.</li>
   </ul>
@@ skipping 76 matching lines @@
 <h4> New APIs </h4>
   <ul>
     <li>The <a href="debugger.html">debugger API</a>
       lets you use the Chrome Developer Tools
       on one or more tabs remotely.
     <li>The <a href="devtools.html">developer tools APIs</a>
       provide support for extending Chrome Developer Tools.
       The inspected window API lets you interact with the inspected window.
       The network API lets you retrive information about network requests.
       The panels API lets you add panels and sidebars.
-    <li>The <a href="input.ime.html">input method editor API</a>
-      lets you add custom input methods
-      such as complex language characters
-      directly to the system's input device.
     <li>The <a href="pageCapture.html">page capture API</a>
       lets you save a tab as MHTML.
     <li> The <a href="privacy.html">privacy API</a>
       lets you control usage of the features
       in Chrome that can affect a user's privacy policy.
   </ul>
 
 <h4> Manifest changes </h4>
   <ul>
     <li>The new
@@ skipping 438 matching lines @@
 <h4> Manifest changes </h4>
   <ul>
     <li>The <a href="manifest.html#geolocation">geolocation</a> permission
       gives an extension access to the user's physical location.
     <li><a href="match_patterns.html">Match patterns</a> can now select all
       schemes or all URLs.
     <li>Access to file:/// URLs no longer triggers the "access to your machine"
       security warning, but now requires user opt-in from the extensions
       management page.
   </ul>