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

net/quic/chromium/quic_utils_chromium_test.cc

Index: net/quic/chromium/quic_utils_chromium_test.cc
diff --git a/net/quic/chromium/quic_utils_chromium_test.cc b/net/quic/chromium/quic_utils_chromium_test.cc
index b0cdfefb0f42e7219f987546eaba8a189bd9db8c..9642568f81a5e27cdad9e2e427af7db0de513d43 100644
--- a/net/quic/chromium/quic_utils_chromium_test.cc
+++ b/net/quic/chromium/quic_utils_chromium_test.cc
@@ -8,21 +8,20 @@
 
 #include "testing/gtest/include/gtest/gtest.h"
 
-using std::map;
 
 namespace net {
 namespace test {
 namespace {
 
 TEST(QuicUtilsChromiumTest, FindOrNullTest) {
-  map<int, int> m;
+  std::map<int, int> m;
   m[0] = 2;
 
   // Check FindOrNull
   int* p1 = FindOrNull(m, 0);
   CHECK_EQ(*p1, 2);
   ++(*p1);
-  const map<int, int>& const_m = m;
+  const std::map<int, int>& const_m = m;
   const int* p2 = FindOrNull(const_m, 0);
   CHECK_EQ(*p2, 3);
   CHECK(FindOrNull(m, 1) == nullptr);
@@ -41,7 +40,7 @@ TEST(QuicUtilsChromiumTest, FindOrDieTest) {
   EXPECT_EQ(20, FindOrDie(m, 10));
 
   // Make sure we can lookup values in a const map.
-  const map<int, int>& const_m = m;
+  const std::map<int, int>& const_m = m;
   EXPECT_EQ(20, FindOrDie(const_m, 10));
 }