Samples for `enableReferrer` and `allowThirdPartyCookies` should use the `privacy` namespace.

chrome/common/extensions/docs/samples.json

 {
   "api": {
     "chrome.bookmarks.create": "bookmarks.html#method-create",
     "chrome.bookmarks.export": "bookmarks.html#method-export",
     "chrome.bookmarks.get": "bookmarks.html#method-get",
     "chrome.bookmarks.getChildren": "bookmarks.html#method-getChildren",
     "chrome.bookmarks.getRecent": "bookmarks.html#method-getRecent",
     "chrome.bookmarks.getSubTree": "bookmarks.html#method-getSubTree",
     "chrome.bookmarks.getTree": "bookmarks.html#method-getTree",
     "chrome.bookmarks.import": "bookmarks.html#method-import",
@@ skipping 389 matching lines @@
       "zip_path": "examples\/api\/override\/blank_ntp.zip"
     },
     {
       "api_calls": [
         "chrome.extension.isAllowedIncognitoAccess"
       ],
       "crx_path": null,
       "description": "Sample extension which demonstrates how to access a preference.",
       "features": [
         "browser_action",
-        "contentSettings",
         "experimental",
-        "popup"
+        "popup",
+        "privacy"
+      ],
+      "icon": null,
+      "id": "0bf0930a32829dfb77170535ecb27adc2de3998a",
+      "name": "Block\/allow referrer API example extension",
+      "packaged_app": false,
+      "path": "examples\/api\/preferences\/enableReferrer\/",
+      "protocols": [],
+      "search_string": "BLOCK\/ALLOW REFERRER API EXAMPLE EXTENSION SAMPLE EXTENSION WHICH DEMONSTRATES HOW TO ACCESS A PREFERENCE. BROWSER_ACTION EXPERIMENTAL POPUP PRIVACY CHROME.EXTENSION.ISALLOWEDINCOGNITOACCESS",
+      "source_files": [
+        "manifest.json",
+        "popup.css",
+        "popup.html",
+        "popup.js"
+      ],
+      "source_hash": "c2114f2faf51a5fdc08002cab3a5bdaefb2073cd",
+      "zip_path": "examples\/api\/preferences\/enableReferrer.zip"
+    },
+    {
+      "api_calls": [
+        "chrome.extension.isAllowedIncognitoAccess"
+      ],
+      "crx_path": null,
+      "description": "Sample extension which demonstrates how to access a preference.",
+      "features": [
+        "browser_action",
+        "experimental",
+        "popup",
+        "privacy"
       ],
       "icon": null,
       "id": "7da105f28e200d42510aff3591dfa5aeb0b82605",
       "name": "Block\/allow third-party cookies API example extension",
       "packaged_app": false,
       "path": "examples\/api\/preferences\/allowThirdPartyCookies\/",
       "protocols": [],
-      "search_string": "BLOCK\/ALLOW THIRD-PARTY COOKIES API EXAMPLE EXTENSION SAMPLE EXTENSION WHICH DEMONSTRATES HOW TO ACCESS A PREFERENCE. BROWSER_ACTION CONTENTSETTINGS EXPERIMENTAL POPUP CHROME.EXTENSION.ISALLOWEDINCOGNITOACCESS",
+      "search_string": "BLOCK\/ALLOW THIRD-PARTY COOKIES API EXAMPLE EXTENSION SAMPLE EXTENSION WHICH DEMONSTRATES HOW TO ACCESS A PREFERENCE. BROWSER_ACTION EXPERIMENTAL POPUP PRIVACY CHROME.EXTENSION.ISALLOWEDINCOGNITOACCESS",
       "source_files": [
         "manifest.json",
-        "popup.html"
+        "popup.css",
+        "popup.html",
+        "popup.js"
       ],
-      "source_hash": "67648790a6ee68e071627e870868d5582e1ef2b5",
+      "source_hash": "7ccf3f2ab08bbde36f62df34e93fc57eaff2fa3a",
       "zip_path": "examples\/api\/preferences\/allowThirdPartyCookies.zip"
     },
     {
       "api_calls": [
         "chrome.experimental.devtools.audits.addCategory",
         "chrome.extension.onRequest",
         "chrome.extension.sendRequest",
         "chrome.tabs.executeScript",
         "chrome.tabs.sendRequest"
       ],
@@ skipping 362 matching lines @@
       "source_files": [
         "background.html",
         "content_script.js",
         "manifest.json",
         "options.html"
       ],
       "source_hash": "54b5469031ddcb2097f39dbaae1bcd81ae650154",
       "zip_path": "examples\/extensions\/email_this_page.zip"
     },
     {
-      "api_calls": [
-        "chrome.extension.isAllowedIncognitoAccess"
-      ],
-      "crx_path": null,
-      "description": "Sample extension which demonstrates how to access a preference.",
-      "features": [
-        "browser_action",
-        "contentSettings",
-        "experimental",
-        "popup"
-      ],
-      "icon": null,
-      "id": "0bf0930a32829dfb77170535ecb27adc2de3998a",
-      "name": "Enable\/disable referrers API example extension",
-      "packaged_app": false,
-      "path": "examples\/api\/preferences\/enableReferrer\/",
-      "protocols": [],
-      "search_string": "ENABLE\/DISABLE REFERRERS API EXAMPLE EXTENSION SAMPLE EXTENSION WHICH DEMONSTRATES HOW TO ACCESS A PREFERENCE. BROWSER_ACTION CONTENTSETTINGS EXPERIMENTAL POPUP CHROME.EXTENSION.ISALLOWEDINCOGNITOACCESS",
-      "source_files": [
-        "manifest.json",
-        "popup.html"
-      ],
-      "source_hash": "e3514a32b04876d79e64f31ffe7beb4bbae98d33",
-      "zip_path": "examples\/api\/preferences\/enableReferrer.zip"
-    },
-    {
       "api_calls": [],
       "crx_path": null,
       "description": "A sample extension which uses Google Analytics to track usage.",
       "features": [
         "background_page",
         "browser_action",
         "popup"
       ],
       "icon": "analytics-extension-icon-128.png",
       "id": "763a08e9b06595d785568a8d392b95a2f3700258",
@@ skipping 588 matching lines @@
       "search_string": "MAPPY FINDS ADDRESSES IN THE WEB PAGE YOURE ON AND POPS UP A MAP WINDOW. BACKGROUND_PAGE PAGE_ACTION POPUP TABS CHROME.EXTENSION.GETBACKGROUNDPAGE CHROME.EXTENSION.ONREQUEST CHROME.PAGEACTION.HIDE CHROME.PAGEACTION.SETTITLE CHROME.PAGEACTION.SHOW CHROME.TABS.GET CHROME.TABS.GETSELECTED CHROME.TABS.ONSELECTIONCHANGED CHROME.TABS.ONUPDATED CHROME.TABS.SENDREQUEST",
       "source_files": [
         "background.html",
         "background.js",
         "manifest.json",
         "mappy_content_script.js",
         "popup.css",
         "popup.html",
         "popup.js"
       ],
-      "source_hash": "175f010b7eacb72207b7018732d3e6dca4e8d164",
+      "source_hash": "8446b89f4eb2d8cb6b49e306e87845b9dd385af5",
       "zip_path": "examples\/extensions\/mappy.zip"
     },
     {
       "api_calls": [
         "chrome.browserAction.onClicked",
         "chrome.tabs.get",
         "chrome.tabs.getAllInWindow",
         "chrome.tabs.move",
         "chrome.windows.get",
         "chrome.windows.getAll",
@@ skipping 888 matching lines @@
       "source_files": [
         "manifest.json",
         "popup.html",
         "sample.css"
       ],
       "source_hash": "c8bfc2b60f25c24dc3c5aaf75dd635c9419df66d",
       "zip_path": "examples\/api\/extension\/isAllowedAccess.zip"
     }
   ]
 }