Adding a BrowsingDataHelper class to hold some useful methods.

chrome/browser/browsing_data_helper.h

Index: chrome/browser/browsing_data_helper.h
diff --git a/chrome/browser/browsing_data_helper.h b/chrome/browser/browsing_data_helper.h
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+++ b/chrome/browser/browsing_data_helper.h
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+// 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.
+
+// Defines methods relevant to all code that wants to work with browsing data.
+
+#ifndef CHROME_BROWSER_BROWSING_DATA_HELPER_H_
+#define CHROME_BROWSER_BROWSING_DATA_HELPER_H_
+#pragma once
+
+#include <string>
+
+#include "base/basictypes.h"
+
+namespace WebKit {
+class WebString;
+}
+
+class GURL;
+
+class BrowsingDataHelper {
+ public:
+  // Returns true iff the provided scheme is (really) web safe, and suitable
+  // for treatment as "browsing data". This relies on the definition of web safe
+  // in ChildProcessSecurityPolicy, but excluding schemes like
+  // `chrome-extension`.
+  static bool IsValidScheme(const std::string& scheme);
+  static bool IsValidScheme(const WebKit::WebString& scheme);
+  static bool HasValidScheme(const GURL& origin);
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(BrowsingDataHelper);
+};
+
+#endif  // CHROME_BROWSER_BROWSING_DATA_HELPER_H_