Revert "Implement a JavaScript API for document scanning"

chrome/common/extensions/api/_permission_features.json

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This features file defines permissions for extension APIs implemented
 // under src/chrome.
 // See extensions/common/features/* to understand this file, in particular
 // feature.h, simple_feature.h, and base_feature_provider.h.
 
 // To add a new whitelisted ID, SHA-1 it and force it to uppercase. In Bash:
@@ skipping 312 matching lines @@
     "extension_types": ["extension", "legacy_packaged_app"]
   },
   "declarativeContent": {
     "channel": "stable",
     "extension_types": ["extension"]
   },
   "desktopCapture": {
     "channel": "stable",
     "extension_types": ["extension", "platform_app"]
   },
-  "documentScan": {
-    "channel": "dev",
-    "extension_types": ["extension", "platform_app"]
-  },
   "downloads": {
     "channel": "stable",
     "extension_types": ["extension"]
   },
   "downloads.open": {
     "channel": "stable",
     "extension_types": ["extension"]
   },
   "downloads.shelf": {
     "channel": "stable",
@@ skipping 708 matching lines @@
   "webstorePrivate": {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app", "hosted_app"],
     "whitelist": [
       "B44D08FD98F1523ED5837D78D0A606EA9D6206E5",  // Web Store
       "2653F6F6C39BC6EEBD36A09AFB92A19782FF7EB4",  // Enterprise Web Store
       "2779FA8B45841D61A37207CCFAC9CB393964FE5B"   // Login Proxy (prototype)
     ]
   }
 }