[bindings] Eliminate custom bindings for DeviceOrientationEvent.

Source/bindings/templates/conversions.cpp

Index: Source/bindings/templates/conversions.cpp
diff --git a/Source/bindings/templates/conversions.cpp b/Source/bindings/templates/conversions.cpp
index fdf9d7815aed9abea7f9c0e074b5894594c9be78..8747d9a4dad46d5c2056646f7dddb1fe19efe02c 100644
--- a/Source/bindings/templates/conversions.cpp
+++ b/Source/bindings/templates/conversions.cpp
@@ -17,8 +17,13 @@
 {% endif %}
 {% else %}{# item.declare_variable #}
 {% if item.assign_expression %}
+{% if thing.is_raw_primitive %}
+{{item.cpp_name}}Value = {{item.assign_expression}};
+{{item.cpp_name}} = &{{item.cpp_name}}Value;
+{% else %}
 {{item.cpp_name}} = {{item.assign_expression}};
 {% endif %}
+{% endif %}
 {% endif %}{# item.declare_variable #}
 {% if item.set_expression %}
 {{item.set_expression}};