net::SimplifyUrlForRequest fast path for URLs without {user,pass,ref} parts.

net/base/url_util.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/base/url_util.h"
 
 #include "build/build_config.h"
 
 #if defined(OS_POSIX)
 #include <netinet/in.h>
@@ skipping 355 matching lines @@
       default:
         NOTREACHED();
     }
   }
 
   return false;
 }
 
 GURL SimplifyUrlForRequest(const GURL& url) {
   DCHECK(url.is_valid());
+  // Fast path to avoid re-canonicalization via ReplaceComponents.
+  if (!url.has_username() && !url.has_password() && !url.has_ref())
+    return url;
   GURL::Replacements replacements;
   replacements.ClearUsername();
   replacements.ClearPassword();
   replacements.ClearRef();
   return url.ReplaceComponents(replacements);
 }
 
 void GetIdentityFromURL(const GURL& url,
                         base::string16* username,
                         base::string16* password) {
@@ skipping 44 matching lines @@
   }
 
   if (is_local6)
     *is_local6 = false;
   return normalized_host == "localhost" ||
          normalized_host == "localhost.localdomain" ||
          IsNormalizedLocalhostTLD(normalized_host);
 }
 
 }  // namespace net