Refactor der::Input helper methods into new constructors

net/cert/internal/test_helpers.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/cert/internal/test_helpers.h"
 
 #include "base/base64.h"
 #include "base/base_paths.h"
 #include "base/files/file_util.h"
 #include "base/path_service.h"
@@ skipping 14 matching lines @@
 
   *os << "[" << b64 << "]";
 }
 
 bool operator==(const Input& a, const Input& b) {
   return a.Equals(b);
 }
 
 }  // namespace der
 
-der::Input InputFromString(const std::string* s) {
-  return der::Input(reinterpret_cast<const uint8_t*>(s->data()), s->size());
-}
-
 der::Input SequenceValueFromString(const std::string* s) {
-  der::Parser parser(InputFromString(s));
+  der::Parser parser((der::Input(s)));
   der::Input data;
   if (!parser.ReadTag(der::kSequence, &data)) {
     ADD_FAILURE();
     return der::Input();
   }
   if (parser.HasMore()) {
     ADD_FAILURE();
     return der::Input();
   }
   return data;
@@ skipping 51 matching lines @@
     if (mapping.value && !mapping.optional) {
       return ::testing::AssertionFailure() << "PEM block missing: "
                                            << mapping.block_name;
     }
   }
 
   return ::testing::AssertionSuccess();
 }
 
 }  // namespace net