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

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

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file has been auto-generated by code_generator_v8.py. DO NOT MODIFY!
 
 #include "config.h"
 #include "V8TestPermissiveDictionary.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 
 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);
     v8::TryCatch block;
     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.
     } else {
         bool booleanMember = booleanMemberValue->BooleanValue();
         impl.setBooleanMember(booleanMember);
     }
 
+    return true;
 }
 
 v8::Local<v8::Value> toV8(const TestPermissiveDictionary& impl, v8::Local<v8::Object> creationContext, v8::Isolate* isolate)
 {
     v8::Local<v8::Object> v8Object = v8::Object::New(isolate);
     toV8TestPermissiveDictionary(impl, v8Object, creationContext, isolate);
     return v8Object;
 }
 
 void toV8TestPermissiveDictionary(const TestPermissiveDictionary& impl, v8::Local<v8::Object> dictionary, v8::Local<v8::Object> creationContext, v8::Isolate* isolate)
 {
     if (impl.hasBooleanMember()) {
         dictionary->Set(v8String(isolate, "booleanMember"), v8Boolean(impl.booleanMember(), isolate));
     }
 
 }
 
 TestPermissiveDictionary NativeValueTraits<TestPermissiveDictionary>::nativeValue(const v8::Local<v8::Value>& value, v8::Isolate* isolate, ExceptionState& exceptionState)
 {
     TestPermissiveDictionary impl;
     V8TestPermissiveDictionary::toImpl(isolate, value, impl, exceptionState);
     return impl;
 }
 
 } // namespace blink