Move unlimitedStorage permission from //chrome to //extensions

extensions/common/api/_permission_features.json

 // Copyright 2014 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/extensions.
 
 // See extensions/common/features/* to understand this file, in particular
 // feature.h, simple_feature.h, and base_feature_provider.h.
 
@@ skipping 255 matching lines @@
     {
       "channel": "stable",
       "extension_types": ["extension", "legacy_packaged_app", "platform_app"]
     },
     {
       "channel": "stable",
       "extension_types": ["hosted_app"],
       "whitelist": ["B44D08FD98F1523ED5837D78D0A606EA9D6206E5"]  // Web Store
     }
   ],
+  "unlimitedStorage": {
+    "channel": "stable",
+    "extension_types": [
+      "extension", "legacy_packaged_app", "hosted_app", "platform_app"
+    ]
+  },
   "usb": [
     {
       "channel": "stable",
       "extension_types": ["platform_app"]
     },
     {
       "channel": "stable",
       "extension_types": ["extension"],
       "whitelist": [
         "496B6890097EB6E19809ADEADD095A8721FBB2E0",  // FIDO U2F APIs
@@ skipping 62 matching lines @@
     "extension_types": ["extension", "legacy_packaged_app"]
      }
   ],
   "webRequestBlocking": [
     {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app"]
     }
   ]
 }