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

net/base/url_util.cc

Index: net/base/url_util.cc
diff --git a/net/base/url_util.cc b/net/base/url_util.cc
index 111c95400a821e9ab53a8ec3fd7988e35c92243e..062481fef392c9a9b103e152f86932addb997757 100644
--- a/net/base/url_util.cc
+++ b/net/base/url_util.cc
@@ -373,6 +373,9 @@ bool IsLocalhost(base::StringPiece host) {
 
 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();