Create our own wrapper Url class to avoid extra string copies

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GURL does a lot of string copying, we don't like that, let's make our own 
wrapper that saves the strings.

Original issue reported on code.google.com by sligocki@google.com on 23 Feb 2011 at 7:22

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Original comment by sligocki@google.com on 23 Feb 2011 at 9:12

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Certainly GURL has an interface that will let us extract StringPieces with a 
certain amount of pain.

Original comment by jmaes...@google.com on 23 Feb 2011 at 9:47

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Thanks Naomi.

Original comment by sligocki@google.com on 11 Mar 2011 at 2:46

• Changed state: Fixed