Move the `privacy` extension API out of experimental.

chrome/common/extensions/docs/static/privacy.html

+<div id="pageData-name" class="pageData">Privacy</div>
+
+<!-- BEGIN AUTHORED CONTENT -->
+<p id="classSummary">
+  Use the <code>chrome.privacy</code> module to control usage of the features in
+  Chrome that can affect a user's privacy. This module relies on the
+  <a href="types.html#ChromeSetting">ChromeSetting prototype of the type API</a>
+  for getting and setting Chrome's configuration.
+</p>
+
+<p class="note">
+  The <a href="http://www.google.com/intl/en/landing/chrome/google-chrome-privacy-whitepaper.pdf">Chrome Privacy Whitepaper</a>
+  gives background detail regarding the features which this API can control.
+</p>
+
+<h2 id="manifest">Manifest</h2>
+<p>
+  You must declare the "privacy" permission in your extension's
+  <a href="manifest.html"> manifest</a> to use the API. For example:

[battre, 2012/01/24 12:29:18]

nit: remove space before manifest

[Mike West, 2012/01/24 13:49:33]

Done.

+</p>
+
+<pre>{
+  "name": "My extension",
+  ...
+  <b>"permissions": [
+    "privacy"
+  ]</b>,
+  ...
+}</pre>
+
+<h2 id="usage">Usage</h2>
+
+<p>
+  Reading the current value of a Chrome setting is straightforward. You'll first
+  need to find the property you're interested in, then you'll call
+  <code>get()</code> on that object in order to retrieve it's current value and
+  your extension's level of control. For example, to determine if Chrome's
+  Autofill feature is enabled, you'd write:
+</p>
+
+<pre>chrome.privacy.services.autofillEnabled.get({}, function(details) {
+  if (details.value)
+    console.log('Autofill is on!');
+  else
+    console.log('Autofill is off!');
+});</pre>
+
+<p>
+  Changing the value of a setting is a little bit more complex, simply because
+  you first must verify that your extension can control the setting. Chrome will
+  deny access to a setting if the setting is either locked to a specific value

[battre, 2012/01/24 12:29:18]

technically, it won't deny access but only ignore the written value until it
becomes the most important (policy is revoked; other extension clears its
preference)

[Mike West, 2012/01/24 13:49:33]

Gah. Complexity.

Done.

+  by enterprise policies (<code>levelOfControl</code> will be set to
+  "not_controllable"), or if another extension is controlling the value
+  (<code>levelOfControl</code> will be set to "controlled_by_other_extensions").
+</p>
+
+<p class="note">
+  Full details about extension's ability to control <code>ChromeSetting</code>s

[battre, 2012/01/24 12:29:18]

nit: "about *an* extension's" or "about extensions'"

[Mike West, 2012/01/24 13:49:33]

The latter. Done. :)

+  can be found under
+  <a href="types.html#ChromeSetting">
+    <code>chrome.types.ChromeSetting</code></a>.
+</p>
+
+<p>
+  This means that you'll need to use the <code>get()</code> method to determine
+  your level of access, and then only call <code>set()</code> if your extension
+  can grab control over the setting:

[battre, 2012/01/24 12:29:18]

not necessary, see above. It is still good practice warn in case we cannot
control the preference.

[Mike West, 2012/01/24 13:49:33]

Done.

+</p>
+
+<pre>chrome.privacy.services.autofillEnabled.get({}, function(details) {
+  if (details.levelOfControl === 'controllable_by_this_extension') {
+    chrome.privacy.services.autofillEnabled.set({ value: true }, function() {
+      if (chrome.extension.lastError === undefined)
+        console.log("Hooray, it worked!");
+      else
+        console.log("Sadness!", chrome.extension.lastError);
+    }
+  }
+});</pre>
+
+<p>
+  If you're interested in changes to a setting's value, add a listener to its
+  <code>onChange</code> event. Among other uses, this will allow you to warn the
+  user if a more recently installed extension grabs control of a setting, or if
+  enterprise policy overrides your control. To listen for changes to Autofill's
+  status, for example, the following code would suffice:
+</p>
+
+<pre>chrome.privacy.services.autofillEnabled.onChange.addListener(
+    function (details) {
+      // The new value is stored in `details.value`, the new level of control
+      // in `details.levelOfControl`, and `details.incognitoSpecific` will be
+      // `true` if the value is specific to Incognito mode.
+    });</pre>
+
+<h2 id="examples">Examples</h2>
+<p>
+  For example code, see the
+  <a href="samples.html#privacy">Privacy API samples</a>.
+</p>
+<!-- END AUTHORED CONTENT -->