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

Source/bindings/tests/results/core/V8TestDictionaryDerived.cpp

Index: Source/bindings/tests/results/core/V8TestDictionaryDerived.cpp
diff --git a/Source/bindings/tests/results/core/V8TestDictionaryDerived.cpp b/Source/bindings/tests/results/core/V8TestDictionaryDerived.cpp
index 189661495ebe5faf5fd5aecea5c3f49cbf5bd844..df5d4a7c6df08a0e71500a9269b79424965d71a1 100644
--- a/Source/bindings/tests/results/core/V8TestDictionaryDerived.cpp
+++ b/Source/bindings/tests/results/core/V8TestDictionaryDerived.cpp
@@ -12,45 +12,49 @@
 
 namespace blink {
 
-void V8TestDictionaryDerivedImplementedAs::toImpl(v8::Isolate* isolate, v8::Local<v8::Value> v8Value, TestDictionaryDerivedImplementedAs& impl, ExceptionState& exceptionState)
+bool V8TestDictionaryDerivedImplementedAs::toImpl(v8::Isolate* isolate, v8::Local<v8::Value> v8Value, TestDictionaryDerivedImplementedAs& impl, ExceptionState& exceptionState)
 {
     if (isUndefinedOrNull(v8Value))
-        return;
+        return true;
     if (!v8Value->IsObject()) {
         exceptionState.throwTypeError("cannot convert to dictionary.");
-        return;
+        return false;
     }
 
-    V8TestDictionary::toImpl(isolate, v8Value, impl, exceptionState);
-    if (exceptionState.hadException())
-        return;
+    if (!V8TestDictionary::toImpl(isolate, v8Value, impl, exceptionState))
+        return false;
 
     v8::Local<v8::Object> v8Object = v8Value->ToObject(isolate);
     v8::TryCatch block;
     v8::Local<v8::Value> derivedStringMemberValue = v8Object->Get(v8String(isolate, "derivedStringMember"));
     if (block.HasCaught()) {
         exceptionState.rethrowV8Exception(block.Exception());
-        return;
+        return false;
     }
     if (derivedStringMemberValue.IsEmpty() || derivedStringMemberValue->IsUndefined()) {
         // Do nothing.
     } else {
-        TOSTRING_VOID(V8StringResource<>, derivedStringMember, derivedStringMemberValue);
+        V8StringResource<> derivedStringMember = derivedStringMemberValue;
+        if (!derivedStringMember.prepare(exceptionState))
+            return false;
         impl.setDerivedStringMember(derivedStringMember);
     }
 
     v8::Local<v8::Value> derivedStringMemberWithDefaultValue = v8Object->Get(v8String(isolate, "derivedStringMemberWithDefault"));
     if (block.HasCaught()) {
         exceptionState.rethrowV8Exception(block.Exception());
-        return;
+        return false;
     }
     if (derivedStringMemberWithDefaultValue.IsEmpty() || derivedStringMemberWithDefaultValue->IsUndefined()) {
         // Do nothing.
     } else {
-        TOSTRING_VOID(V8StringResource<>, derivedStringMemberWithDefault, derivedStringMemberWithDefaultValue);
+        V8StringResource<> derivedStringMemberWithDefault = derivedStringMemberWithDefaultValue;
+        if (!derivedStringMemberWithDefault.prepare(exceptionState))
+            return false;
         impl.setDerivedStringMemberWithDefault(derivedStringMemberWithDefault);
     }
 
+    return true;
 }
 
 v8::Local<v8::Value> toV8(const TestDictionaryDerivedImplementedAs& impl, v8::Local<v8::Object> creationContext, v8::Isolate* isolate)