Update parsing of stun and turn urls for RFC 7064-7065

Main change is deleting support for @userinfo in turn urls. This was
specified in early internet drafts, but never made it into RFC 7065.

Bug: webrtc:6663, webrtc:10422
Change-Id: Idd315a9e6001326f3104be62be3bd0991adc7db4
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/128423
Commit-Queue: Niels Moller <nisse@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27171}
diff --git a/pc/ice_server_parsing_unittest.cc b/pc/ice_server_parsing_unittest.cc
index 0ec59ca..9f1b817 100644
--- a/pc/ice_server_parsing_unittest.cc
+++ b/pc/ice_server_parsing_unittest.cc
@@ -200,16 +200,9 @@
   EXPECT_FALSE(ParseTurnUrl("?"));
 }
 
-// Test parsing ICE username contained in URL.
-TEST_F(IceServerParsingTest, ParseUsername) {
-  EXPECT_TRUE(ParseTurnUrl("turn:user@hostname"));
-  EXPECT_EQ(1U, turn_servers_.size());
-  EXPECT_EQ("user", turn_servers_[0].credentials.username);
-
-  EXPECT_FALSE(ParseTurnUrl("turn:@hostname"));
-  EXPECT_FALSE(ParseTurnUrl("turn:username@"));
-  EXPECT_FALSE(ParseTurnUrl("turn:@"));
-  EXPECT_FALSE(ParseTurnUrl("turn:user@name@hostname"));
+// Reject pre-RFC 7065 syntax with ICE username contained in URL.
+TEST_F(IceServerParsingTest, ParseRejectsUsername) {
+  EXPECT_FALSE(ParseTurnUrl("turn:user@hostname"));
 }
 
 // Test that username and password from IceServer is copied into the resulting