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:
+</p>
+
+<pre>{
+  "name": "My extension",
+  ...
+  <b>"permissions": [
+    "privacy"
+  ]</b>,
+  ...
+}</pre>
+
+<h2 id="usage">Usage</h2>
+
+<p>
+  Reading the current value of a 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. If the
+  setting has been locked down by enterprise policy, or already been set by
+  another extension, then your extension will be denied write access. You'll
+  use the <code>get()</code> method to determine your level of access, and then
+  call <code>set()</code> if your extension can grab control over the setting:
+</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>
+
+<h2 id="examples">Examples</h2>
+<p>
+  For example code, see the
+  <a href="samples.html#privacy">Privacy API samples</a>.
+</p>
+<!-- END AUTHORED CONTENT -->