Removing references to legacy packaged apps across extension docs.

chrome/common/extensions/docs/server2/templates/intros/browserAction.html

 <p>Use browser actions to put icons
   in the main Google Chrome toolbar,
   to the right of the address bar.
   In addition to its <a href="#icon">icon</a>,
   a browser action can also have
   a <a href="#tooltip">tooltip</a>,
   a <a href="#badge">badge</a>,
   and a <a href="#popups">popup</a>.
   </p>
 
 <p>
 In the following figure,
 the multicolored square
 to the right of the address bar
 is the icon for a browser action.
 A popup is below the icon.
 </p>
 
 <img src="{{static}}/images/browser-action.png"
   width="363" height="226" />
 
 <p>
 If you want to create an icon that isn't always visible,
 use a <a href="pageAction.html">page action</a>
 instead of a browser action.
 </p>
 
-<p class="caution">
-<strong>Note:</strong>
-Packaged apps cannot use browser actions.
-</p>
-
-
-
 <h2 id="manifest">Manifest</h2>
 
 <p>
 Register your browser action in the
 <a href="manifest.html">extension manifest</a>
 like this:
 </p>
 
 <pre>{
   "name": "My extension",
@@ skipping 118 matching lines @@
 
 <h2 id="examples"> Examples </h2>
 
 <p>
 You can find simple examples of using browser actions in the
 <a href="http://src.chromium.org/viewvc/chrome/trunk/src/chrome/common/extensions/docs/examples/api/browserAction/">examples/api/browserAction</a>
 directory.
 For other examples and for help in viewing the source code, see
 <a href="samples.html">Samples</a>.
 </p>