Adds first cut implementation of a private key store abstraction for openssl

net/base/ssl_config_service.h

Index: net/base/ssl_config_service.h
diff --git a/net/base/ssl_config_service.h b/net/base/ssl_config_service.h
index 899b329cddae00a24b7036d79a1aff77b2ddde30..c1ae55327d9fc93131858e1071a878e0885a123d 100644
--- a/net/base/ssl_config_service.h
+++ b/net/base/ssl_config_service.h
@@ -33,7 +33,7 @@ struct SSLConfig {
   bool dns_cert_provenance_checking_enabled;
 
   // Cipher suites which should be explicitly prevented from being used in
-  // addition to those disabled by the net built in policy -- by default, all
+  // addition to those disabled by the net built-in policy -- by default, all
   // cipher suites supported by the underlying SSL implementation will be
   // enabled except for:
   // - Null encryption cipher suites.