Stop forcing optional permission on usbDevices section

chrome/common/extensions/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 "chrome/common/extensions/permissions/permissions_data.h"
 
 #include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/string16.h"
 #include "base/stringprintf.h"
@@ skipping 574 matching lines @@
 bool PermissionsData::ParsePermissions(Extension* extension, string16* error) {
   initial_required_permissions_.reset(new InitialPermissions);
   if (!ParseHelper(extension,
                    keys::kPermissions,
                    &initial_required_permissions_->api_permissions,
                    &initial_required_permissions_->host_permissions,
                    error)) {
     return false;
   }
 
-  // Check for any permissions that are optional only.
-  for (APIPermissionSet::const_iterator iter =
-           initial_required_permissions_->api_permissions.begin();
-       iter != initial_required_permissions_->api_permissions.end(); ++iter) {
-    if ((*iter)->info()->must_be_optional()) {
-      *error = ErrorUtils::FormatErrorMessageUTF16(
-          errors::kPermissionMustBeOptional, (*iter)->info()->name());
-      return false;
-    }
-  }
-
   // TODO(jeremya/kalman) do this via the features system by exposing the
   // app.window API to platform apps, with no dependency on any permissions.
   // See http://crbug.com/120069.
   if (extension->is_platform_app()) {
     initial_required_permissions_->api_permissions.insert(
         APIPermission::kAppCurrentWindowInternal);
     initial_required_permissions_->api_permissions.insert(
         APIPermission::kAppRuntime);
     initial_required_permissions_->api_permissions.insert(
         APIPermission::kAppWindow);
@@ skipping 35 matching lines @@
   optional_permission_set_ = new PermissionSet(
       initial_optional_permissions_->api_permissions,
       initial_optional_permissions_->host_permissions,
       URLPatternSet());
 
   initial_required_permissions_.reset();
   initial_optional_permissions_.reset();
 }
 
 }  // namespace extensions