Switch various ValueTypeToString()s to base::Value::GetTypeName().

tools/json_schema_compiler/util.h

 // Copyright (c) 2012 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.
 
 #ifndef TOOLS_JSON_SCHEMA_COMPILER_UTIL_H_
 #define TOOLS_JSON_SCHEMA_COMPILER_UTIL_H_
 
 #include <memory>
 #include <string>
 #include <utility>
@@ skipping 189 matching lines @@
 template <class T>
 std::unique_ptr<base::Value> CreateValueFromArray(const std::vector<T>& from) {
   std::unique_ptr<base::ListValue> list(new base::ListValue());
   PopulateListFromArray(from, list.get());
   return std::move(list);
 }
 
 template <class T>
 std::unique_ptr<base::Value> CreateValueFromOptionalArray(
     const std::unique_ptr<std::vector<T>>& from) {
-  if (from)
-    return CreateValueFromArray(*from);
-  return nullptr;
+  return from ? CreateValueFromArray(*from) : nullptr;
 }
 
-std::string ValueTypeToString(base::Value::Type type);
-
 }  // namespace util
 }  // namespace json_schema_compiler
 
 #endif  // TOOLS_JSON_SCHEMA_COMPILER_UTIL_H_