IDL: Drop value conversion (V8 -> C++) macros from generated code

Source/bindings/tests/results/core/V8TestPermissiveDictionary.cpp

Index: Source/bindings/tests/results/core/V8TestPermissiveDictionary.cpp
diff --git a/Source/bindings/tests/results/core/V8TestPermissiveDictionary.cpp b/Source/bindings/tests/results/core/V8TestPermissiveDictionary.cpp
index d6bce6e8ea1fdc358f0662cfbe10761df4c9570d..803207832b5ae43407599500093715dc112cc8d7 100644
--- a/Source/bindings/tests/results/core/V8TestPermissiveDictionary.cpp
+++ b/Source/bindings/tests/results/core/V8TestPermissiveDictionary.cpp
@@ -11,13 +11,13 @@
 
 namespace blink {
 
-void V8TestPermissiveDictionary::toImpl(v8::Isolate* isolate, v8::Local<v8::Value> v8Value, TestPermissiveDictionary& impl, ExceptionState& exceptionState)
+bool V8TestPermissiveDictionary::toImpl(v8::Isolate* isolate, v8::Local<v8::Value> v8Value, TestPermissiveDictionary& impl, ExceptionState& exceptionState)
 {
     if (isUndefinedOrNull(v8Value))
-        return;
+        return true;
     if (!v8Value->IsObject()) {
         // Do nothing.
-        return;
+        return true;
     }
 
     v8::Local<v8::Object> v8Object = v8Value->ToObject(isolate);
@@ -25,7 +25,7 @@ void V8TestPermissiveDictionary::toImpl(v8::Isolate* isolate, v8::Local<v8::Valu
     v8::Local<v8::Value> booleanMemberValue = v8Object->Get(v8String(isolate, "booleanMember"));
     if (block.HasCaught()) {
         exceptionState.rethrowV8Exception(block.Exception());
-        return;
+        return false;
     }
     if (booleanMemberValue.IsEmpty() || booleanMemberValue->IsUndefined()) {
         // Do nothing.
@@ -34,6 +34,7 @@ void V8TestPermissiveDictionary::toImpl(v8::Isolate* isolate, v8::Local<v8::Valu
         impl.setBooleanMember(booleanMember);
     }
 
+    return true;
 }
 
 v8::Local<v8::Value> toV8(const TestPermissiveDictionary& impl, v8::Local<v8::Object> creationContext, v8::Isolate* isolate)