Replace Scoped* heap types with bssl::UniquePtr.

Unlike the Scoped* types, bssl::UniquePtr is available to C++ users, and
offered for a large variety of types.  The 'extern "C++"' trick is used
to make the C++ bits digestible to C callers that wrap header files in
'extern "C"'.

Change-Id: Ifbca4c2997d6628e33028c7d7620c72aff0f862e
Reviewed-on: https://boringssl-review.googlesource.com/10521
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
diff --git a/include/openssl/x509.h b/include/openssl/x509.h
index 5bbf651..c32a6e7 100644
--- a/include/openssl/x509.h
+++ b/include/openssl/x509.h
@@ -1224,6 +1224,38 @@
 
 #ifdef  __cplusplus
 }
+
+extern "C++" {
+
+namespace bssl {
+
+namespace internal {
+
+BORINGSSL_MAKE_STACK_DELETER(X509, X509_free)
+BORINGSSL_MAKE_DELETER(X509, X509_free)
+BORINGSSL_MAKE_DELETER(X509_ALGOR, X509_ALGOR_free)
+BORINGSSL_MAKE_DELETER(X509_CRL, X509_CRL_free)
+BORINGSSL_MAKE_DELETER(X509_CRL_METHOD, X509_CRL_METHOD_free)
+BORINGSSL_MAKE_DELETER(X509_EXTENSION, X509_EXTENSION_free)
+BORINGSSL_MAKE_DELETER(X509_INFO, X509_INFO_free)
+BORINGSSL_MAKE_DELETER(X509_LOOKUP, X509_LOOKUP_free)
+BORINGSSL_MAKE_DELETER(X509_NAME, X509_NAME_free)
+BORINGSSL_MAKE_DELETER(X509_NAME_ENTRY, X509_NAME_ENTRY_free)
+BORINGSSL_MAKE_DELETER(X509_PKEY, X509_PKEY_free)
+BORINGSSL_MAKE_DELETER(X509_POLICY_TREE, X509_policy_tree_free)
+BORINGSSL_MAKE_DELETER(X509_REQ, X509_REQ_free)
+BORINGSSL_MAKE_DELETER(X509_REVOKED, X509_REVOKED_free)
+BORINGSSL_MAKE_DELETER(X509_SIG, X509_SIG_free)
+BORINGSSL_MAKE_DELETER(X509_STORE, X509_STORE_free)
+BORINGSSL_MAKE_DELETER(X509_STORE_CTX, X509_STORE_CTX_free)
+BORINGSSL_MAKE_DELETER(X509_VERIFY_PARAM, X509_VERIFY_PARAM_free)
+
+}  // namespace internal
+
+}  // namespace bssl
+
+}  /* extern C++ */
+
 #endif
 
 #define X509_R_AKID_MISMATCH 100