Add quic_map_util.

net/tools/quic/quic_http_response_cache.cc

Index: net/tools/quic/quic_http_response_cache.cc
diff --git a/net/tools/quic/quic_http_response_cache.cc b/net/tools/quic/quic_http_response_cache.cc
index 65ff6390e92652fa785f596605521a507006cc48..c079081dd7dcffd1f10bfbeac341ef347eb3bfa6 100644
--- a/net/tools/quic/quic_http_response_cache.cc
+++ b/net/tools/quic/quic_http_response_cache.cc
@@ -8,10 +8,10 @@
 
 #include "base/files/file_enumerator.h"
 #include "base/files/file_util.h"
-#include "base/stl_util.h"
 #include "net/http/http_util.h"
 #include "net/quic/platform/api/quic_bug_tracker.h"
 #include "net/quic/platform/api/quic_logging.h"
+#include "net/quic/platform/api/quic_map_util.h"
 #include "net/quic/platform/api/quic_ptr_util.h"
 #include "net/quic/platform/api/quic_text_utils.h"
 #include "net/spdy/spdy_http_utils.h"
@@ -316,7 +316,7 @@ void QuicHttpResponseCache::AddResponseImpl(StringPiece host,
 
   DCHECK(!host.empty()) << "Host must be populated, e.g. \"www.google.com\"";
   string key = GetKey(host, path);
-  if (base::ContainsKey(responses_, key)) {
+  if (QuicContainsKey(responses_, key)) {
     QUIC_BUG << "Response for '" << key << "' already exists!";
     return;
   }
@@ -360,8 +360,7 @@ void QuicHttpResponseCache::MaybeAddServerPushResources(
     bool found_existing_response = false;
     {
       QuicWriterMutexLock lock(&response_mutex_);
-      found_existing_response =
-          base::ContainsKey(responses_, GetKey(host, path));
+      found_existing_response = QuicContainsKey(responses_, GetKey(host, path));
     }
     if (!found_existing_response) {
       // Add a server push response to responses map, if it is not in the map.