Move contentSettings extension API out of experimental

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 667 matching lines @@
     {
       "api_calls": [
         "chrome.tabs.get",
         "chrome.tabs.getSelected"
       ],
       "crx_path": null,
       "description": "Shows the content settings for the current site.",
       "features": [
         "browser_action",
         "contentSettings",
-        "experimental",
         "popup",
         "tabs"
       ],
       "icon": null,
       "id": "e1f97e61e28ff33131d66dd28a4ed70a77874a51",
       "name": "Content settings",
       "packaged_app": false,
       "path": "examples\/api\/contentSettings\/",
       "protocols": [],
-      "search_string": "CONTENT SETTINGS SHOWS THE CONTENT SETTINGS FOR THE CURRENT SITE. BROWSER_ACTION CONTENTSETTINGS EXPERIMENTAL POPUP TABS CHROME.TABS.GET CHROME.TABS.GETSELECTED",
+      "search_string": "CONTENT SETTINGS SHOWS THE CONTENT SETTINGS FOR THE CURRENT SITE. BROWSER_ACTION CONTENTSETTINGS POPUP TABS CHROME.TABS.GET CHROME.TABS.GETSELECTED",
       "source_files": [
         "manifest.json",
         "popup.html"
       ],
-      "source_hash": "aab21662d31c6d61f2304eacce32a3b6ca8bb207",
+      "source_hash": "14d647a5ea1fa8551089fdb8810b6acaf16530cf",
       "zip_path": "examples\/api\/contentSettings.zip"
     },
     {
       "api_calls": [
         "chrome.contextMenus.create"
       ],
       "crx_path": null,
       "description": "Shows some of the features of the Context Menus API",
       "features": [
         "background_page",
@@ skipping 1616 matching lines @@
       "source_files": [
         "manifest.json",
         "popup.html",
         "sample.css"
       ],
       "source_hash": "c8bfc2b60f25c24dc3c5aaf75dd635c9419df66d",
       "zip_path": "examples\/api\/extension\/isAllowedAccess.zip"
     }
   ]
 }