[bindings] Eliminate custom bindings for DeviceOrientationEvent.

Source/bindings/templates/methods.cpp

Index: Source/bindings/templates/methods.cpp
diff --git a/Source/bindings/templates/methods.cpp b/Source/bindings/templates/methods.cpp
index eb039ef987f3f99339daed14701f54a8a84f714c..ea274670467e8e0c295e344da0bb560c432f7ddf 100644
--- a/Source/bindings/templates/methods.cpp
+++ b/Source/bindings/templates/methods.cpp
@@ -83,6 +83,10 @@ static void {{method.name}}{{method.overload_index}}Method{{world_suffix}}(const
     } else {
         {{argument.set_default_value}};
     }
+    {% elif argument.is_undefined_to_null %}
+    if (!isUndefinedOrNull(info[{{argument.index}}])) {
+        {{generate_argument(method, argument, world_suffix) | indent(8)}}
+    }
     {% else %}
     {{generate_argument(method, argument, world_suffix) | indent}}
     {% endif %}
@@ -96,6 +100,9 @@ static void {{method.name}}{{method.overload_index}}Method{{world_suffix}}(const
 {# FIXME: remove EventListener special case #}
 {% if argument.idl_type == 'EventListener' %}
 RefPtr<{{argument.idl_type}}> {{argument.name}}
+{% elif argument.is_undefined_to_null %}
+{{argument.cpp_type}}* {{argument.name}} = nullptr;
+{{argument.cpp_type}} {{argument.name}}Value
 {%- else %}
 {{argument.cpp_type}} {{argument.name}}
 {%- endif %}{# argument.idl_type == 'EventListener' #}