Use SHA-1 functions from BoringSSL directly.

net/quic/test_tools/quic_test_utils.h

Index: net/quic/test_tools/quic_test_utils.h
diff --git a/net/quic/test_tools/quic_test_utils.h b/net/quic/test_tools/quic_test_utils.h
index 0209669c5a9818d64c917926369362f931721d14..d93bc3c98da17539e347fbf0ef8e43d224fd3ab9 100644
--- a/net/quic/test_tools/quic_test_utils.h
+++ b/net/quic/test_tools/quic_test_utils.h
@@ -216,6 +216,9 @@ class QuicFlagSaver {
   ~QuicFlagSaver();
 };
 
+// Compute SHA-1 hash of the supplied std::string.
+std::string Sha1Hash(base::StringPiece data);
+
 // Simple random number generator used to compute random numbers suitable
 // for pseudo-randomly dropping packets in tests.  It works by computing
 // the sha1 hash of the current seed, and using the first 64 bits as