Take the Extension Storage 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 62 matching lines @@
     "chrome.experimental.devtools.console.getMessages": "experimental.devtools.console.html#method-getMessages",
     "chrome.experimental.devtools.console.onMessageAdded": "experimental.devtools.console.html#event-onMessageAdded",
     "chrome.experimental.infobars.show": "experimental.infobars.html#method-show",
     "chrome.experimental.speechInput.isRecording": "experimental.speechInput.html#method-isRecording",
     "chrome.experimental.speechInput.onError": "experimental.speechInput.html#event-onError",
     "chrome.experimental.speechInput.onResult": "experimental.speechInput.html#event-onResult",
     "chrome.experimental.speechInput.onSoundEnd": "experimental.speechInput.html#event-onSoundEnd",
     "chrome.experimental.speechInput.onSoundStart": "experimental.speechInput.html#event-onSoundStart",
     "chrome.experimental.speechInput.start": "experimental.speechInput.html#method-start",
     "chrome.experimental.speechInput.stop": "experimental.speechInput.html#method-stop",
-    "chrome.experimental.storage.onChanged": "experimental.storage.html#event-onChanged",
     "chrome.extension.connect": "extension.html#method-connect",
     "chrome.extension.getBackgroundPage": "extension.html#method-getBackgroundPage",
     "chrome.extension.getExtensionTabs": "extension.html#method-getExtensionTabs",
     "chrome.extension.getURL": "extension.html#method-getURL",
     "chrome.extension.getViews": "extension.html#method-getViews",
     "chrome.extension.isAllowedFileSchemeAccess": "extension.html#method-isAllowedFileSchemeAccess",
     "chrome.extension.isAllowedIncognitoAccess": "extension.html#method-isAllowedIncognitoAccess",
     "chrome.extension.onConnect": "extension.html#event-onConnect",
     "chrome.extension.onConnectExternal": "extension.html#event-onConnectExternal",
     "chrome.extension.onRequest": "extension.html#event-onRequest",
@@ skipping 37 matching lines @@
     "chrome.pageAction.setTitle": "pageAction.html#method-setTitle",
     "chrome.pageAction.show": "pageAction.html#method-show",
     "chrome.pageCapture.saveAsMHTML": "pageCapture.html#method-saveAsMHTML",
     "chrome.permissions.contains": "permissions.html#method-contains",
     "chrome.permissions.getAll": "permissions.html#method-getAll",
     "chrome.permissions.onAdded": "permissions.html#event-onAdded",
     "chrome.permissions.onRemoved": "permissions.html#event-onRemoved",
     "chrome.permissions.remove": "permissions.html#method-remove",
     "chrome.permissions.request": "permissions.html#method-request",
     "chrome.proxy.onProxyError": "proxy.html#event-onProxyError",
+    "chrome.storage.onChanged": "storage.html#event-onChanged",
     "chrome.tabs.captureVisibleTab": "tabs.html#method-captureVisibleTab",
     "chrome.tabs.connect": "tabs.html#method-connect",
     "chrome.tabs.create": "tabs.html#method-create",
     "chrome.tabs.detectLanguage": "tabs.html#method-detectLanguage",
     "chrome.tabs.executeScript": "tabs.html#method-executeScript",
     "chrome.tabs.get": "tabs.html#method-get",
     "chrome.tabs.getAllInWindow": "tabs.html#method-getAllInWindow",
     "chrome.tabs.getCurrent": "tabs.html#method-getCurrent",
     "chrome.tabs.getSelected": "tabs.html#method-getSelected",
     "chrome.tabs.highlight": "tabs.html#method-highlight",
@@ skipping 2000 matching lines @@
       "path": "examples\/api\/storage\/stylizr\/",
       "protocols": [],
       "search_string": "STYLIZR SPRUCE UP YOUR PAGES WITH CUSTOM CSS. <ALL_URLS> BROWSER_ACTION EXPERIMENTAL OPTIONS_PAGE TABS CHROME.EXTENSION.GETURL CHROME.TABS.INSERTCSS",
       "source_files": [
         "manifest.json",
         "options.html",
         "options.js",
         "popup.html",
         "popup.js"
       ],
-      "source_hash": "ace9d2fa9b1731f38c77d827b85548c425be92a7",
+      "source_hash": "d037912040032793d06755ea44f5e638e8bac10f",
       "zip_path": "examples\/api\/storage\/stylizr.zip"
     },
     {
       "api_calls": [
         "chrome.browserAction.onClicked",
         "chrome.extension.getURL",
         "chrome.tabs.create",
         "chrome.tabs.get",
         "chrome.tabs.getAllInWindow",
         "chrome.tabs.getSelected",
@@ skipping 287 matching lines @@
         "manifest.json",
         "popup.html",
         "popup.js",
         "sample.css"
       ],
       "source_hash": "62ca453d8d1551ff63dd7c78b49d546bc3af17c6",
       "zip_path": "examples\/api\/extension\/isAllowedAccess.zip"
     }
   ]
 }