Remove superflous std::hash specialization

include/util/guidance/name_announcements.hpp

@@ -73,7 +73,6 @@ template <typename StringView> inline auto decompose(const StringView &lhs, cons
         std::string str(view);
         std::transform(
             str.begin(), str.end(), str.begin(), [](unsigned char c) { return std::tolower(c); });
-        );
         auto front = str.find_first_not_of(' ');
 
         if (front == std::string::npos)

include/util/string_view.hpp

@@ -14,21 +14,4 @@ using StringView = std::string_view;
 } // namespace util
 } // namespace osrm
 
-// Specializing hash<> for user-defined type in std namespace, this is standard conforming.
-namespace std
-{
-template <> struct hash<::osrm::util::StringView> final
-{
-    std::size_t operator()(::osrm::util::StringView v) const noexcept
-    {
-        // Bring into scope and call un-qualified for ADL:
-        // remember we want to be able to switch impl. above.
-        using std::begin;
-        using std::end;
-
-        return boost::hash_range(begin(v), end(v));
-    }
-};
-} // namespace std
-
 #endif /* OSRM_STRING_VIEW_HPP */