Abstracts SHA256 context for NSS / OpenSSL.

net/base/openssl_memory_private_key_store.cc

Index: net/base/openssl_memory_private_key_store.cc
diff --git a/net/base/openssl_memory_private_key_store.cc b/net/base/openssl_memory_private_key_store.cc
index bc64b570cf269208f74ff7b7bd3dc3abf5bb0bca..5572b672c8ed184a1c47a7afe4cff86010690960 100644
--- a/net/base/openssl_memory_private_key_store.cc
+++ b/net/base/openssl_memory_private_key_store.cc
@@ -11,6 +11,7 @@
 #include "base/logging.h"
 #include "base/openssl_util.h"
 #include "base/singleton.h"
+#include "base/synchronization/lock.h"
 #include "net/base/x509_certificate.h"
 
 namespace net {
@@ -52,7 +53,7 @@ class OpenSSLMemoryKeyStore : public OpenSSLPrivateKeyStore {
 
  private:
   std::vector<EVP_PKEY*> keys_;
-  Lock lock_;
+  base::Lock lock_;
 
   DISALLOW_COPY_AND_ASSIGN(OpenSSLMemoryKeyStore);
 };