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

net/quic/core/frames/quic_stop_waiting_frame.cc

Index: net/quic/core/frames/quic_stop_waiting_frame.cc
diff --git a/net/quic/core/frames/quic_stop_waiting_frame.cc b/net/quic/core/frames/quic_stop_waiting_frame.cc
index 8a243b0808fb68e6bedb5008576ed2ab70e09ce5..b051beb0d6a098d31fef7af5bc4e98207239ddc2 100644
--- a/net/quic/core/frames/quic_stop_waiting_frame.cc
+++ b/net/quic/core/frames/quic_stop_waiting_frame.cc
@@ -6,8 +6,6 @@
 
 #include "net/quic/core/quic_constants.h"
 
-using std::ostream;
-
 namespace net {
 
 QuicStopWaitingFrame::QuicStopWaitingFrame()
@@ -15,7 +13,8 @@ QuicStopWaitingFrame::QuicStopWaitingFrame()
 
 QuicStopWaitingFrame::~QuicStopWaitingFrame() {}
 
-ostream& operator<<(ostream& os, const QuicStopWaitingFrame& sent_info) {
+std::ostream& operator<<(std::ostream& os,
+                         const QuicStopWaitingFrame& sent_info) {
   os << "{ least_unacked: " << sent_info.least_unacked << " }\n";
   return os;
 }