Implement a new IDN display policy

net/base/net_util.h

Index: net/base/net_util.h
diff --git a/net/base/net_util.h b/net/base/net_util.h
index 628abe2095f67d89840f1cd3ae8731e7e51f29ec..009ced9e79352a8458e366b7de705d2b4285da9f 100644
--- a/net/base/net_util.h
+++ b/net/base/net_util.h
@@ -153,15 +153,7 @@ NET_EXPORT std::string GetHostOrSpecFromURL(const GURL& url);
 //
 // The input should be the canonicalized ASCII host name from GURL. This
 // function does NOT accept UTF-8!
-//
-// |languages| is a comma separated list of ISO 639 language codes. It
-// is used to determine whether a hostname is 'comprehensible' to a user
-// who understands languages listed. |host| will be converted to a
-// human-readable form (Unicode) ONLY when each component of |host| is
-// regarded as 'comprehensible'. Scipt-mixing is not allowed except that
-// Latin letters in the ASCII range can be mixed with a limited set of
-// script-language pairs (currently Han, Kana and Hangul for zh,ja and ko).
-// When |languages| is empty, even that mixing is not allowed.
+// |languages| is not used any more and will be removed.
 NET_EXPORT base::string16 IDNToUnicode(const std::string& host,
                                        const std::string& languages);
 
@@ -215,13 +207,15 @@ NET_EXPORT base::string16 StripWWWFromHost(const GURL& url);
 NET_EXPORT int SetNonBlocking(int fd);
 
 // Formats the host in |url| and appends it to |output|.  The host formatter
-// takes the same accept languages component as ElideURL().
+// takes the same accept languages component as ElideURL(), but it does not
+// affect the result. It'll be removed.
 NET_EXPORT void AppendFormattedHost(const GURL& url,
                                     const std::string& languages,
                                     base::string16* output);
 
-// Creates a string representation of |url|. The IDN host name may be in Unicode
-// if |languages| accepts the Unicode representation. |format_type| is a bitmask
+// Creates a string representation of |url|. The IDN host name is turned to
+// Unicode if the Unicode representation is deemed safe. |languages| is not
+// used any more and will be removed. |format_type| is a bitmask
 // of FormatUrlTypes, see it for details. |unescape_rules| defines how to clean
 // the URL for human readability. You will generally want |UnescapeRule::SPACES|
 // for display to the user if you can handle spaces, or |UnescapeRule::NORMAL|
@@ -260,7 +254,7 @@ NET_EXPORT base::string16 FormatUrl(const GURL& url,
                                     size_t* offset_for_adjustment);
 NET_EXPORT base::string16 FormatUrlWithOffsets(
     const GURL& url,
-    const std::string& languages,
+    const std::string& langauges,
     FormatUrlTypes format_types,
     UnescapeRule::Type unescape_rules,
     url::Parsed* new_parsed,