IDL: Add toRestricted{Float,Double}() helpers to V8Binding.h

Source/bindings/templates/methods.cpp

 {##############################################################################}
 {% macro generate_method(method, world_suffix) %}
 {% filter conditional(method.conditional_string) %}
 static void {{method.name}}{{method.overload_index}}Method{{world_suffix}}(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     {# Local variables #}
     {% if method.has_exception_state %}
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "{{method.name}}", "{{interface_name}}", info.Holder(), info.GetIsolate());
     {% endif %}
     {# Overloaded methods have length checked during overload resolution #}
@@ skipping 157 matching lines @@
                                (argument.index + 1, argument.name)) | indent}}
     return;
 }
 {% endif %}{# not argument.use_permissive_dictionary_conversion #}
 {{argument.v8_value_to_local_cpp_value}};
 {% else %}{# argument.is_nullable #}
 {{argument.v8_value_to_local_cpp_value}};
 {% endif %}{# argument.is_nullable #}
 {# Type checking, possibly throw a TypeError, per:
    http://www.w3.org/TR/WebIDL/#es-type-mapping #}
-{% if argument.has_type_checking_unrestricted %}
-{# Non-finite floating point values (NaN, +Infinity or −Infinity), per:
-   http://heycam.github.io/webidl/#es-float
-   http://heycam.github.io/webidl/#es-double #}
-if (!std::isfinite({{argument.name}})) {
-    {{throw_type_error(method, '"%s parameter %s is non-finite."' %
-                               (argument.idl_type, argument.index + 1)) | indent}}
-    return;
-}
-{% elif argument.has_type_checking_interface and not argument.is_variadic_wrapper_type %}
+{% if argument.has_type_checking_interface and not argument.is_variadic_wrapper_type %}
 {# Type checking for wrapper interface types (if interface not implemented,
    throw a TypeError), per http://www.w3.org/TR/WebIDL/#es-interface
    Note: for variadic arguments, the type checking is done for each matched
    argument instead; see argument.is_variadic_wrapper_type code-path above. #}
 if (!{{argument.name}}{% if argument.is_nullable %} && !isUndefinedOrNull(info[{{argument.index}}]){% endif %}) {
     {{throw_type_error(method, '"parameter %s is not of type \'%s\'."' %
                                (argument.index + 1, argument.idl_type)) | indent}}
     return;
 }
 {% elif argument.enum_validation_expression %}
@@ skipping 462 matching lines @@
                               if method.overloads else
                               method.runtime_enabled_function) %}
     prototypeObject->Set(v8AtomicString(isolate, "{{method.name}}"), v8::FunctionTemplate::New(isolate, {{cpp_class_or_partial}}V8Internal::{{method.name}}MethodCallback, v8Undefined(), defaultSignature, {{method.number_of_required_arguments}})->GetFunction());
     {% endfilter %}{# runtime_enabled() #}
     {% endfilter %}{# exposed() #}
     {% endfilter %}{# per_context_enabled() #}
     {% endfor %}
     {% endif %}
 }
 {%- endmacro %}