Create fewer local v8::TryCatch objects in generated bindings code

Source/bindings/v8/V8StringResource.h

Index: Source/bindings/v8/V8StringResource.h
diff --git a/Source/bindings/v8/V8StringResource.h b/Source/bindings/v8/V8StringResource.h
index c7fbdf8a317ad4937dc6856dcdefd114d5e4c5a7..7aa42e0b6241d5d9ea3360a4bf507595481eb053 100644
--- a/Source/bindings/v8/V8StringResource.h
+++ b/Source/bindings/v8/V8StringResource.h
@@ -169,13 +169,22 @@ enum V8StringResourceMode {
 template <V8StringResourceMode Mode = DefaultMode>
 class V8StringResource {
 public:
+    V8StringResource()
+        : m_mode(Externalize)
+    {
+    }
+
     V8StringResource(v8::Handle<v8::Value> object)
         : m_v8Object(object)
         , m_mode(Externalize)
-        , m_string()
     {
     }
 
+    void operator=(v8::Handle<v8::Value> object)
+    {
+        m_v8Object = object;
+    }
+
     bool prepare()
     {
         if (m_v8Object.IsEmpty())