Adding a BrowsingDataHelper class to hold some useful methods.

chrome/browser/browsing_data_helper.cc

+// 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.
+
+#include "chrome/browser/browsing_data_helper.h"
+
+#include "base/utf_string_conversions.h"
+#include "chrome/common/url_constants.h"
+#include "content/public/browser/child_process_security_policy.h"
+#include "googleurl/src/gurl.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebString.h"
+
+// Static
+bool BrowsingDataHelper::IsValidScheme(const std::string& scheme) {
+  content::ChildProcessSecurityPolicy* policy =
+      content::ChildProcessSecurityPolicy::GetInstance();
+  return (policy->IsWebSafeScheme(scheme) &&
+          scheme != chrome::kChromeDevToolsScheme &&
+          scheme != chrome::kExtensionScheme);
+}
+
+// Static
+bool BrowsingDataHelper::IsValidScheme(const WebKit::WebString& scheme) {
+  return BrowsingDataHelper::IsValidScheme(UTF16ToUTF8(scheme));
+}
+
+// Static
+bool BrowsingDataHelper::HasValidScheme(const GURL& origin) {
+  return BrowsingDataHelper::IsValidScheme(origin.scheme());
+}