Allow silent update for default-installed apps.

extensions/common/permissions/permissions_data.cc

 // Copyright (c) 2013 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.
 
 #include "extensions/common/permissions/permissions_data.h"
 
 #include "base/command_line.h"
 #include "content/public/common/url_constants.h"
 #include "extensions/common/constants.h"
 #include "extensions/common/error_utils.h"
@@ skipping 33 matching lines @@
 }
 
 // static
 void PermissionsData::SetPolicyDelegate(PolicyDelegate* delegate) {
   g_policy_delegate = delegate;
 }
 
 // static
 bool PermissionsData::CanSilentlyIncreasePermissions(
     const Extension* extension) {
-  return extension->location() != Manifest::INTERNAL;
+  return extension->location() != Manifest::INTERNAL ||
+      extension->creation_flags() & Extension::WAS_INSTALLED_BY_DEFAULT;

[not at google - send to devlin, 2015/02/17 17:07:24]

Hm, seems odd that EXTERNAL_PREF/REGISTRY isn't excluded here, I hope/thought
that we didn't allow silent sideloading of extensions. Ah well, something to
look into later.

 }
 
 // static
 bool PermissionsData::CanExecuteScriptEverywhere(const Extension* extension) {
   if (extension->location() == Manifest::COMPONENT)
     return true;
 
   const ExtensionsClient::ScriptingWhitelist& whitelist =
       ExtensionsClient::Get()->GetScriptingWhitelist();
 
@@ skipping 295 matching lines @@
     return ACCESS_WITHHELD;
 
   if (error) {
     *error = ErrorUtils::FormatErrorMessage(manifest_errors::kCannotAccessPage,
                                             document_url.spec());
   }
   return ACCESS_DENIED;
 }
 
 }  // namespace extensions