Update some callers to use more direct ways of constructing IPAddress from well known literals.

net/tools/quic/end_to_end_test.cc

Index: net/tools/quic/end_to_end_test.cc
diff --git a/net/tools/quic/end_to_end_test.cc b/net/tools/quic/end_to_end_test.cc
index 441a5d9beac9e697c29560c1dd2d49d996f2b028..923808bdeb48b66c83380a35d800575f0136ed84 100644
--- a/net/tools/quic/end_to_end_test.cc
+++ b/net/tools/quic/end_to_end_test.cc
@@ -547,12 +547,11 @@ TEST_P(EndToEndTest, SimpleRequestResponseWithLargeReject) {
   EXPECT_EQ(3, client_->client()->GetNumSentClientHellos());
 }
 
-// TODO(rch): figure out how to detect missing v6 supprt (like on the linux
+// TODO(rch): figure out how to detect missing v6 support (like on the linux
 // try bots) and selectively disable this test.
 TEST_P(EndToEndTest, DISABLED_SimpleRequestResponsev6) {
-  IPAddress ip;
-  CHECK(ip.AssignFromIPLiteral("::1"));
-  server_address_ = IPEndPoint(ip, server_address_.port());
+  server_address_ =
+      IPEndPoint(IPAddress::IPv6Localhost(), server_address_.port());
   ASSERT_TRUE(Initialize());
 
   EXPECT_EQ(kFooResponseBody, client_->SendSynchronousRequest("/foo"));