Remove various 'using std::' statements from QUIC code and use

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 06f5399bc253082e3fd47d660cf1bfe662dfdd6c..1e4b16dbeb2339eb95ce3a1d6ef931d78fefce1d 100644
--- a/net/tools/quic/end_to_end_test.cc
+++ b/net/tools/quic/end_to_end_test.cc
@@ -8,6 +8,7 @@
 #include <cstdint>
 #include <list>
 #include <memory>
+#include <ostream>
 #include <string>
 #include <utility>
 #include <vector>
@@ -64,9 +65,7 @@ using base::IntToString;
 using base::StringPiece;
 using base::WaitableEvent;
 using net::EpollServer;
-using std::ostream;
 using std::string;
-using std::vector;
 
 namespace net {
 namespace test {
@@ -98,7 +97,7 @@ struct TestParams {
         force_hol_blocking(force_hol_blocking),
         use_cheap_stateless_reject(use_cheap_stateless_reject) {}
 
-  friend ostream& operator<<(ostream& os, const TestParams& p) {
+  friend std::ostream& operator<<(std::ostream& os, const TestParams& p) {
     os << "{ server_supported_versions: "
        << QuicVersionVectorToString(p.server_supported_versions);
     os << " client_supported_versions: "