Add GURL::HostNoBracketsPiece()

url/gurl.h

Index: url/gurl.h
diff --git a/url/gurl.h b/url/gurl.h
index 74efbb5021e67515fa14738bd315a6338d344daf..6f4536d95c81129205c2a5aa4ccd1edb9e094f9c 100644
--- a/url/gurl.h
+++ b/url/gurl.h
@@ -380,6 +380,9 @@ class URL_EXPORT GURL {
   // literals. This can be useful for passing to getaddrinfo().
   std::string HostNoBrackets() const;
 
+  // Returns the same characters as HostNoBrackets(), avoiding a copy.
+  base::StringPiece HostNoBracketsPiece() const;
+
   // Returns true if this URL's host matches or is in the same domain as
   // the given input string. For example, if the hostname of the URL is
   // "www.google.com", this will return true for "com", "google.com", and