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

net/quic/core/congestion_control/hybrid_slow_start.cc

Index: net/quic/core/congestion_control/hybrid_slow_start.cc
diff --git a/net/quic/core/congestion_control/hybrid_slow_start.cc b/net/quic/core/congestion_control/hybrid_slow_start.cc
index 3224cd67cf67b71518d2387a3ede3603f2a6ae61..16b7dcf78a86a3ccc7bbee14ca0080e1c027ed80 100644
--- a/net/quic/core/congestion_control/hybrid_slow_start.cc
+++ b/net/quic/core/congestion_control/hybrid_slow_start.cc
@@ -6,8 +6,6 @@
 
 #include <algorithm>
 
-using std::max;
-using std::min;
 
 namespace net {
 
@@ -88,11 +86,11 @@ bool HybridSlowStart::ShouldExitSlowStart(QuicTime::Delta latest_rtt,
     int64_t min_rtt_increase_threshold_us =
         min_rtt.ToMicroseconds() >> kHybridStartDelayFactorExp;
     // Ensure the rtt threshold is never less than 2ms or more than 16ms.
-    min_rtt_increase_threshold_us =
-        min(min_rtt_increase_threshold_us, kHybridStartDelayMaxThresholdUs);
+    min_rtt_increase_threshold_us = std::min(min_rtt_increase_threshold_us,
+                                             kHybridStartDelayMaxThresholdUs);
     QuicTime::Delta min_rtt_increase_threshold =
-        QuicTime::Delta::FromMicroseconds(max(min_rtt_increase_threshold_us,
-                                              kHybridStartDelayMinThresholdUs));
+        QuicTime::Delta::FromMicroseconds(std::max(
+            min_rtt_increase_threshold_us, kHybridStartDelayMinThresholdUs));
 
     if (current_min_rtt_ > min_rtt + min_rtt_increase_threshold) {
       hystart_found_ = DELAY;