[Extensions] Sync the 'allowed scripting on all urls' preference

sync/protocol/extension_specifics.proto

 // 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.
 //
 // Sync protocol datatype extension for extensions.
 
 // Update proto_value_conversions{.h,.cc,_unittest.cc} if you change
 // any fields in this file.
 
 syntax = "proto2";
@@ skipping 24 matching lines @@
 
   // The name of the extension. Used for bookmark apps.
   optional string name = 6;
 
   // Whether this extension was installed remotely, and hasn't been approved by
   // a user in chrome yet.
   optional bool remote_install = 7;
 
   // Whether this extension was installed by the custodian of a supervised user.
   optional bool installed_by_custodian = 8;
+
+  // Whether this extension has explicit user consent access to all urls. This
+  // may not be present if the user hasn't given an explicit preference!

[not at google - send to devlin, 2015/02/11 01:34:51]

I would own up to what this is, a tri-state boolean - i.e. idiomatically
optional, whereas most fields are pragmatically optional (e.g. |name| isn't
*really* optional). And, why.

[Devlin, 2015/02/11 17:52:21]

Done.

+  optional bool all_urls_enabled = 9;
 }