content: Extract url utility functions into url_utils.{h,cc}

content/public/common/url_utils.h

+// Copyright 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.
+
+#ifndef CONTENT_PUBLIC_COMMON_URL_UTILS_H_
+#define CONTENT_PUBLIC_COMMON_URL_UTILS_H_
+
+#include "content/common/content_export.h"
+
+class GURL;
+
+namespace content {
+
+// Null terminated list of schemes that are savable. This function can be
+// invoked on any thread.
+CONTENT_EXPORT const char* const* GetSavableSchemes();
+
+// Returns true if the url has a scheme for WebUI.  See also
+// WebUIControllerFactory::UseWebUIForURL in the browser process.
+CONTENT_EXPORT bool HasWebUIScheme(const GURL& url);
+
+// Check whether we can do the saving page operation for the specified URL.
+CONTENT_EXPORT bool IsSavableURL(const GURL& url);
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_COMMON_URL_UTILS_H_