Implemented proper support for checking schemes and requested resource types.

chrome/browser/extensions/api/declarative_webrequest/webrequest_helpers.h

+// 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.
+
+// Helper functions used for the WebRequest API.
+
+#ifndef CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_HELPERS_H_
+#define CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_HELPERS_H_
+#pragma once
+
+#include <string>
+#include <vector>
+
+namespace base {
+class Value;
+}
+
+namespace extensions {
+namespace declarative_webrequest_helpers {
+
+// Converts a ValueList |value| of strings into a vector. Returns true if
+// successful.
+bool GetAsStringVector(const base::Value* value, std::vector<std::string>* out);
+
+}  // namespace declarative_webrequest_helpers
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_HELPERS_H_