Do not sanitize about:blank/#foo & about:blank?foo

url/url_constants.cc

Index: url/url_constants.cc
diff --git a/url/url_constants.cc b/url/url_constants.cc
index 73c9a7671522071593cc8cb50a1ccb67a72ef763..37fc82c1c450626d44f7b5c7bc5fbb6e34098746 100644
--- a/url/url_constants.cc
+++ b/url/url_constants.cc
@@ -8,6 +8,9 @@ namespace url {
 
 const char kAboutBlankURL[] = "about:blank";
 
+const char kAboutBlankPath[] = "blank";
+const char kAboutBlankWithHashPath[] = "blank/";
+
 const char kAboutScheme[] = "about";
 const char kBlobScheme[] = "blob";
 const char kContentScheme[] = "content";