[DevTools] Compatibility with old STL libraries

third_party/WebKit/Source/platform/inspector_protocol/String16STL.h

 // Copyright 2016 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 String16STL_h
 #define String16STL_h
 
 #include <cstdlib>
 #include <cstring>
 #include <stdint.h>
@@ skipping 225 matching lines @@
 // compile!
 // TODO(eostroukhov): Eradicate
 class String {
 public:
     String() {};
     String(const String16& other) {};
     operator String16() const { return String16(); };
 };
 } // namespace WTF
 
+#if !defined(__APPLE__) || defined(_LIBCPP_VERSION)
 
 namespace std {
 template<> struct hash<String16> {
     std::size_t operator()(const String16& string) const
     {
         return string.hash();
     }
 };
 
 } // namespace std
 
+#endif // !defined(__APPLE__) || defined(_LIBCPP_VERSION)
+
 using String = WTF::String;
 
 #endif // !defined(String16STL_h)