Move quic_flags.h from net/quic/core to net/quic/platform and split into api and impl.

net/quic/core/quic_buffered_packet_store_test.cc

 // Copyright (c) 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/core/quic_buffered_packet_store.h"
 
 #include <list>
 #include <string>
 
-#include "net/quic/core/quic_flags.h"
+#include "net/quic/platform/api/quic_flags.h"
 #include "net/quic/test_tools/mock_clock.h"
 #include "net/quic/test_tools/quic_buffered_packet_store_peer.h"
 #include "net/quic/test_tools/quic_test_utils.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using std::string;
 
 namespace net {
 
@@ skipping 456 matching lines @@
   EXPECT_FALSE(store_.HasBufferedPackets(connection_id));
   EXPECT_FALSE(store_.HasChlosBuffered());
   store_.DiscardPackets(connection_id);
   EXPECT_FALSE(store_.HasBufferedPackets(connection_id));
   EXPECT_FALSE(store_.HasChlosBuffered());
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace net