Enable WebContents elevation for managed users.

chrome/browser/managed_mode/scoped_extension_elevation.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/browser/managed_mode/scoped_extension_elevation.h"
+
+#include "chrome/browser/managed_mode/managed_user_service.h"
+
+ScopedExtensionElevation::ScopedExtensionElevation(ManagedUserService* service)
+    : service_(service) {
+}
+
+void ScopedExtensionElevation::AddExtension(const std::string& extension_id) {
+  service_->AddElevationForExtension(extension_id);
+  elevated_extensions_.push_back(extension_id);
+}
+
+ScopedExtensionElevation::~ScopedExtensionElevation() {
+  for (size_t i = 0; i < elevated_extensions_.size(); ++i)
+    service_->RemoveElevationForExtension(elevated_extensions_[i]);
+}