Reinstate one check, fix fall out
diff --git a/gRPC-Core.podspec b/gRPC-Core.podspec
index 97bd3c2..de69f1a 100644
--- a/gRPC-Core.podspec
+++ b/gRPC-Core.podspec
@@ -402,7 +402,7 @@
                       'src/core/lib/security/transport/security_connector.h',
                       'src/core/lib/security/transport/security_handshaker.h',
                       'src/core/lib/security/transport/tsi_error.h',
-                      'src/core/lib/security/util/b64.h',
+                      'src/core/lib/slice/b64.h',
                       'src/core/lib/security/util/json_util.h',
                       'src/core/tsi/fake_transport_security.h',
                       'src/core/tsi/ssl_transport_security.h',
@@ -543,7 +543,7 @@
                       'src/core/lib/json/json_reader.c',
                       'src/core/lib/json/json_string.c',
                       'src/core/lib/json/json_writer.c',
-                      'src/core/lib/security/util/b64.c',
+                      'src/core/lib/slice/b64.c',
                       'src/core/lib/slice/percent_encoding.c',
                       'src/core/lib/slice/slice.c',
                       'src/core/lib/slice/slice_buffer.c',
@@ -850,7 +850,7 @@
                               'src/core/lib/security/transport/security_connector.h',
                               'src/core/lib/security/transport/security_handshaker.h',
                               'src/core/lib/security/transport/tsi_error.h',
-                              'src/core/lib/security/util/b64.h',
+                              'src/core/lib/slice/b64.h',
                               'src/core/lib/security/util/json_util.h',
                               'src/core/tsi/fake_transport_security.h',
                               'src/core/tsi/ssl_transport_security.h',