Remove the rule that "://" means a standard URL. This fixes a number of bugs...

src/url_canon_stdurl.cc

 // Copyright 2007, 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
@@ skipping 152 matching lines @@
                              int spec_len,
                              const url_parse::Parsed& parsed,
                              CharsetConverter* query_converter,
                              CanonOutput* output,
                              url_parse::Parsed* new_parsed) {
   return DoCanonicalizeStandardURL<char16, char16>(
       URLComponentSource<char16>(spec), parsed, query_converter,
       output, new_parsed);
 }
 
+// It might be nice in the future to optimize this so unchanged components don't
+// need to be recanonicalized. This is especially true since the common case for
+// ReplaceComponents is removing things we don't want, like reference fragments
+// and usernames. These cases can become more efficient if we can assume the
+// rest of the URL is OK with these removed (or only the modified parts
+// recanonicalized). This would be much more complex to implement, however.
+//
+// You would also need to update DoReplaceComponents in url_util.cc which
+// relies on this re-checking everything (see the comment there for why).
 bool ReplaceStandardURL(const char* base,
                         const url_parse::Parsed& base_parsed,
                         const Replacements<char>& replacements,
                         CharsetConverter* query_converter,
                         CanonOutput* output,
                         url_parse::Parsed* new_parsed) {
   URLComponentSource<char> source(base);
   url_parse::Parsed parsed(base_parsed);
   SetupOverrideComponents(base, replacements, &source, &parsed);
   return DoCanonicalizeStandardURL<char, unsigned char>(
@@ skipping 10 matching lines @@
                         url_parse::Parsed* new_parsed) {
   RawCanonOutput<1024> utf8;
   URLComponentSource<char> source(base);
   url_parse::Parsed parsed(base_parsed);
   SetupUTF16OverrideComponents(base, replacements, &utf8, &source, &parsed);
   return DoCanonicalizeStandardURL<char, unsigned char>(
       source, parsed, query_converter, output, new_parsed);
 }
 
 }  // namespace url_canon