Use Web IDL Union types in Service Worker's Cache interface

Source/bindings/templates/union.cpp

Index: Source/bindings/templates/union.cpp
diff --git a/Source/bindings/templates/union.cpp b/Source/bindings/templates/union.cpp
index 9e0bccec36263174f2d35c4a878d9ef435329219..0d02b061cc3a6db1d4efc730ef2164ce602e7dc5 100644
--- a/Source/bindings/templates/union.cpp
+++ b/Source/bindings/templates/union.cpp
@@ -131,9 +131,10 @@ void V8{{container.cpp_class}}::toImpl(v8::Isolate* isolate, v8::Handle<v8::Valu
         return;
     }
 
-    {% endif %}
+    {% else %}
     {# 19. TypeError #}
     exceptionState.throwTypeError("Not a valid union member.");

[haraken, 2014/11/07 00:06:36]

I guess we unconditionally need exceptionState.throwTypeError, but don't we?

[bashi, 2014/11/07 00:24:07]

When I implement this, I thought we need to make this unconditional. But as the
compiler complained, we don't need this statement when we generate step16-18.

[haraken, 2014/11/07 01:15:33]

Makes sense, thanks!

+    {% endif %}
 }
 
 v8::Handle<v8::Value> toV8({{container.cpp_class}}& impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)