Call SetDefaults from the QuicConfig constructor instead of requiring

net/quic/quic_config_test.cc

Index: net/quic/quic_config_test.cc
diff --git a/net/quic/quic_config_test.cc b/net/quic/quic_config_test.cc
index 2263e44e67cfbf2752cc7c7f2dcedd881a34e5b9..914b1371422c3aafd9ac23882adadaec87058eca 100644
--- a/net/quic/quic_config_test.cc
+++ b/net/quic/quic_config_test.cc
@@ -22,15 +22,10 @@ namespace {
 
 class QuicConfigTest : public ::testing::Test {
  protected:
-  QuicConfigTest() {
-    config_.SetDefaults();
-  }
-
   QuicConfig config_;
 };
 
 TEST_F(QuicConfigTest, ToHandshakeMessage) {
-  config_.SetDefaults();
   config_.SetInitialFlowControlWindowToSend(
       kInitialSessionFlowControlWindowForTest);
   config_.SetInitialStreamFlowControlWindowToSend(
@@ -265,7 +260,6 @@ TEST_F(QuicConfigTest, MultipleNegotiatedValuesInVectorTag) {
 
 TEST_F(QuicConfigTest, NoOverLapInCGST) {
   QuicConfig server_config;
-  server_config.SetDefaults();
   QuicTagVector cgst;
   cgst.push_back(kTBBR);
   server_config.SetCongestionFeedback(cgst, kTBBR);