Add a QuicChromiumClock and make QuicClock abstract to match internal code.

net/quic/test_tools/quic_stream_factory_peer.cc

Index: net/quic/test_tools/quic_stream_factory_peer.cc
diff --git a/net/quic/test_tools/quic_stream_factory_peer.cc b/net/quic/test_tools/quic_stream_factory_peer.cc
index 3b90154c82985a3a4c8e6187cb0763de5c69effb..03dbff80981573cb666af8699bb0635bc1fa4470 100644
--- a/net/quic/test_tools/quic_stream_factory_peer.cc
+++ b/net/quic/test_tools/quic_stream_factory_peer.cc
@@ -12,7 +12,7 @@
 #include "net/quic/chromium/quic_http_stream.h"
 #include "net/quic/chromium/quic_stream_factory.h"
 #include "net/quic/core/crypto/quic_crypto_client_config.h"
-#include "net/quic/platform/api/quic_clock.h"
+#include "net/quic/platform/impl/quic_chromium_clock.h"
 #include "net/test/cert_test_util.h"
 #include "net/test/test_data_directory.h"
 
@@ -180,7 +180,7 @@ void QuicStreamFactoryPeer::CacheDummyServerConfig(
   QuicCryptoClientConfig* crypto_config = &factory->crypto_config_;
   QuicCryptoClientConfig::CachedState* cached =
       crypto_config->LookupOrCreate(quic_server_id);
-  QuicClock clock;
+  QuicChromiumClock clock;
   cached->Initialize(server_config, source_address_token, certs, "", "",
                      signature, clock.WallNow(), QuicWallTime::Zero());
   DCHECK(!cached->certs().empty());