Revert 127833 - Re-land alexbost's experimental offscreenTabs API.

chrome/common/extensions/docs/samples.json

 {
   "api": {
     "chrome.bookmarks.create": "bookmarks.html#method-create",
     "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.move": "bookmarks.html#method-move",
     "chrome.bookmarks.onChanged": "bookmarks.html#event-onChanged",
@@ skipping 63 matching lines @@
     "chrome.experimental.devtools.console.onMessageAdded": "experimental.devtools.console.html#event-onMessageAdded",
     "chrome.experimental.downloads.download": "experimental.downloads.html#method-download",
     "chrome.experimental.extension.onInstalled": "experimental.extension.html#event-onInstalled",
     "chrome.experimental.fontSettings.getFontList": "experimental.fontSettings.html#method-getFontList",
     "chrome.experimental.fontSettings.getFontName": "experimental.fontSettings.html#method-getFontName",
     "chrome.experimental.fontSettings.setFontName": "experimental.fontSettings.html#method-setFontName",
     "chrome.experimental.infobars.show": "experimental.infobars.html#method-show",
     "chrome.experimental.keybinding.onCommand": "experimental.keybinding.html#event-onCommand",
     "chrome.experimental.managedMode.enter": "experimental.managedMode.html#method-enter",
     "chrome.experimental.managedMode.get": "experimental.managedMode.html#method-get",
-    "chrome.experimental.offscreenTabs.create": "experimental.offscreenTabs.html#method-create",
-    "chrome.experimental.offscreenTabs.get": "experimental.offscreenTabs.html#method-get",
-    "chrome.experimental.offscreenTabs.getAll": "experimental.offscreenTabs.html#method-getAll",
-    "chrome.experimental.offscreenTabs.onUpdated": "experimental.offscreenTabs.html#event-onUpdated",
-    "chrome.experimental.offscreenTabs.remove": "experimental.offscreenTabs.html#method-remove",
-    "chrome.experimental.offscreenTabs.sendKeyboardEvent": "experimental.offscreenTabs.html#method-sendKeyboardEvent",
-    "chrome.experimental.offscreenTabs.sendMouseEvent": "experimental.offscreenTabs.html#method-sendMouseEvent",
-    "chrome.experimental.offscreenTabs.toDataUrl": "experimental.offscreenTabs.html#method-toDataUrl",
-    "chrome.experimental.offscreenTabs.update": "experimental.offscreenTabs.html#method-update",
     "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.webRequest.onRequest": "experimental.webRequest.html#event-onRequest",
     "chrome.extension.connect": "extension.html#method-connect",
     "chrome.extension.getBackgroundPage": "extension.html#method-getBackgroundPage",
@@ skipping 2425 matching lines @@
         "manifest.json",
         "popup.html",
         "popup.js",
         "sample.css"
       ],
       "source_hash": "8e51dc3a9577065d22ce92f3c838edc5ceaf4e65",
       "zip_path": "examples\/api\/extension\/isAllowedAccess.zip"
     }
   ]
 }