AK: Remove unused JsonValue <=> IPv4Address conversion code

This removes code that isn't used anywhere.

AK/JsonValue.cpp

@@ -181,11 +181,6 @@ JsonValue::JsonValue(const String& value)
     }
 }
 
-JsonValue::JsonValue(const IPv4Address& value)
-    : JsonValue(value.to_string())
-{
-}
-
 JsonValue::JsonValue(const JsonObject& value)
     : m_type(Type::Object)
 {

AK/JsonValue.h

@@ -7,7 +7,6 @@
 #pragma once
 
 #include <AK/Forward.h>
-#include <AK/IPv4Address.h>
 #include <AK/Optional.h>
 #include <AK/String.h>
 #include <AK/StringBuilder.h>
@@ -55,7 +54,6 @@ public:
     JsonValue(bool);
     JsonValue(const char*);
     JsonValue(const String&);
-    JsonValue(const IPv4Address&);
     JsonValue(const JsonArray&);
     JsonValue(const JsonObject&);
 
@@ -85,13 +83,6 @@ public:
         return serialized<StringBuilder>();
     }
 
-    Optional<IPv4Address> to_ipv4_address() const
-    {
-        if (!is_string())
-            return {};
-        return IPv4Address::from_string(as_string());
-    }
-
     int to_int(int default_value = 0) const { return to_i32(default_value); }
     i32 to_i32(i32 default_value = 0) const { return to_number<i32>(default_value); }
     i64 to_i64(i64 default_value = 0) const { return to_number<i64>(default_value); }

Userland/Utilities/ifconfig.cpp

@@ -5,6 +5,7 @@
  */
 
 #include <AK/Assertions.h>
+#include <AK/IPv4Address.h>
 #include <AK/JsonArray.h>
 #include <AK/JsonObject.h>
 #include <AK/NumberFormat.h>