Allow declarative webrequest and webrequest in extensions.

extensions/common/api/_permission_features.json

Index: extensions/common/api/_permission_features.json
diff --git a/extensions/common/api/_permission_features.json b/extensions/common/api/_permission_features.json
index 68d725dbf59c3c291d614b5710c0776a54cb6f91..acb595155aecf1d50e48db649c0366ae5d8dc765 100644
--- a/extensions/common/api/_permission_features.json
+++ b/extensions/common/api/_permission_features.json
@@ -103,6 +103,12 @@
       "81986D4F846CEDDDB962643FA501D1780DD441BB"   // http://crbug.com/407693
     ]
   },
+  "declarativeWebRequest": [
+    {
+      "channel": "beta",
+      "extension_types": ["extension", "legacy_packaged_app"]
+    }
+  ],
   "dns": [
     {
       "channel": "dev",
@@ -304,5 +310,17 @@
         "D519188F86D9ACCEE0412007B227D9936EB9676B"  // GAIA Component Extension
       ]
     }
+  ],
+  "webRequest": [
+    {
+    "channel": "stable",
+    "extension_types": ["extension", "legacy_packaged_app"]
+     }
+  ],
+  "webRequestBlocking": [
+    {
+    "channel": "stable",
+    "extension_types": ["extension", "legacy_packaged_app"]
+    }
   ]
 }