partly import changes from tenfourfox:

- #565: implement nsASCIIMask from M1358297 (41b1fc937)
- #565: M1358297 parts 3 and 4 (3fd15a87a)
- #632: M1424915 M1354233 M1324114 M1343008 M1236277(just backbugs) M1328955 (d87db7e16)
- #632: M1362498 M1397686 M136178 M1320252 M1355875 (82cb3b59e)
- #632: M241788 M1271955 M1249352(p1) + additional local optimizations (438bdb726)
- #632: M1249352 part 2 (2c61821e4)
- #632: M1249352(remaining) M1358297(backbugs) M1369317(pp1,3,4) M1426996 (1eab6170b)

docshell/base/nsDocShell.cpp

@@ -4740,7 +4740,7 @@ nsDocShell::LoadURIWithOptions(const char16_t* aURI,
   // Cleanup the empty spaces that might be on each end.
   uriString.Trim(" ");
   // Eliminate embedded newlines, which single-line text fields now allow:
-  uriString.StripChars("\r\n");
+  uriString.StripCRLF();
   NS_ENSURE_TRUE(!uriString.IsEmpty(), NS_ERROR_FAILURE);
 
   rv = NS_NewURI(getter_AddRefs(uri), uriString);