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diff --git a/chrome/common/net/url_util.h b/chrome/common/net/url_util.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.
+
+#ifndef CHROME_COMMON_NET_URL_UTIL_H_
+#define CHROME_COMMON_NET_URL_UTIL_H_
+#pragma once
+
+#include <string>
+
+class GURL;
+
+namespace ui {
+class Clipboard;
+}
+
+namespace chrome_common_net {
+
+// Writes a string representation of |url| to the system clipboard.
+void WriteURLToClipboard(const GURL& url,
+                         const std::string& languages,
+                         ui::Clipboard *clipboard);
+
+// Returns a new GURL by appending the given query parameter name and the
+// value. Unsafe characters in the name and the value are escaped like
+// %XX%XX. The original query component is preserved if it's present.
+//
+// Examples:
+//
+// AppendQueryParameter(GURL("http://example.com"), "name", "value").spec()
+// => "http://example.com?name=value"
+// AppendQueryParameter(GURL("http://example.com?x=y"), "name", "value").spec()
+// => "http://example.com?x=y&name=value"
+GURL AppendQueryParameter(const GURL& url,
+                          const std::string& name,
+                          const std::string& value);
+
+// Returns a new GURL by appending or replacing the given query parameter name
+// and the value. If |name| appears more than once, only the first name-value
+// pair is replaced. Unsafe characters in the name and the value are escaped
+// like %XX%XX. The original query component is preserved if it's present.
+//
+// Examples:
+//
+// AppendOrReplaceQueryParameter(
+//     GURL("http://example.com"), "name", "new").spec()
+// => "http://example.com?name=value"
+// AppendOrReplaceQueryParameter(
+//     GURL("http://example.com?x=y&name=old"), "name", "new").spec()
+// => "http://example.com?x=y&name=new"
+GURL AppendOrReplaceQueryParameter(const GURL& url,
+                                   const std::string& name,
+                                   const std::string& value);
+
+}  // namespace chrome_common_net
+
+#endif  // CHROME_COMMON_NET_URL_UTIL_H_