GURL: add a HostNoBrackets() method for bracketless IPv6 literals.

src/gurl.h

Index: src/gurl.h
===================================================================
--- src/gurl.h	(revision 101)
+++ src/gurl.h	(working copy)
@@ -242,6 +242,9 @@
   std::string password() const {
     return ComponentString(parsed_.password);
   }
+  // Note that this may be a hostname, an IPv4 address, or an IPv6 literal
+  // surrounded by square brackets, like "[2001:db8::1]".  To exclude these
+  // brackets, use HostNoBrackets() below.
   std::string host() const {
     return ComponentString(parsed_.host);
   }
@@ -307,6 +310,10 @@
   // parameter, and query portions of the URL. It is guaranteed to be ASCII.
   std::string PathForRequest() const;
 
+  // Returns the host, excluding the square brackets surrounding IPv6 address
+  // literals.  This can be useful for passing to getaddrinfo().
+  std::string HostNoBrackets() const;
+
   // Returns true if this URL's host matches or is in the same domain as
   // the given input string. For example if this URL was "www.google.com",
   // this would match "com", "google.com", and "www.google.com