Refactor der::Input helper methods into new constructors

net/socket/ssl_client_socket_unittest.cc

Index: net/socket/ssl_client_socket_unittest.cc
diff --git a/net/socket/ssl_client_socket_unittest.cc b/net/socket/ssl_client_socket_unittest.cc
index bf1cc37b02e85fe52c984dd5d1dd36d7ba9eaf1f..58b12fa13a01c5c3c48776e68bbc2c8198935626 100644
--- a/net/socket/ssl_client_socket_unittest.cc
+++ b/net/socket/ssl_client_socket_unittest.cc
@@ -2383,8 +2383,7 @@ TEST_F(SSLClientSocketTest, EVCertStatusRemovedForNonCompliantCert) {
 namespace {
 
 bool IsValidOCSPResponse(const base::StringPiece& input) {
-  der::Parser parser(der::Input(reinterpret_cast<const uint8_t*>(input.data()),
-                                input.length()));
+  der::Parser parser((der::Input(input)));
   der::Parser sequence;
   return parser.ReadSequence(&sequence) && !parser.HasMore() &&
          sequence.SkipTag(der::kEnumerated) &&