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diff --git a/net/base/data_url.h b/net/base/data_url.h
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include <string>
+
+class GURL;
+
+// See RFC 2397 for a complete description of the 'data' URL scheme.
+//
+// Briefly, a 'data' URL has the form:
+//
+//   data:[<mediatype>][;base64],<data>
+//
+// The <mediatype> is an Internet media type specification (with optional
+// parameters.)  The appearance of ";base64" means that the data is encoded as
+// base64.  Without ";base64", the data (as a sequence of octets) is represented
+// using ASCII encoding for octets inside the range of safe URL characters and
+// using the standard %xx hex encoding of URLs for octets outside that range.
+// If <mediatype> is omitted, it defaults to text/plain;charset=US-ASCII.  As a
+// shorthand, "text/plain" can be omitted but the charset parameter supplied.
+//
+class DataURL {
+ public:
+  // This method can be used to parse a 'data' URL into its component pieces.
+  //
+  // The resulting mime_type is normalized to lowercase.  The data is the
+  // decoded data (e.g.., if the data URL specifies base64 encoding, then the
+  // returned data is base64 decoded, and any %-escaped bytes are unescaped).
+  //
+  // If the URL is malformed, then this method will return false, and its
+  // output variables will remain unchanged.  On success, true is returned.
+  //
+  static bool Parse(const GURL& url,
+                    std::string* mime_type,
+                    std::string* charset,
+                    std::string* data);
+};