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

Source/bindings/templates/union.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}}. DO NOT MODIFY!
 
 #include "config.h"
 #include "{{header_filename}}"
 
 {% macro assign_and_return_if_hasinstance(member) %}
 if (V8{{member.type_name}}::hasInstance(v8Value, isolate)) {
     {{member.cpp_local_type}} cppValue = V8{{member.type_name}}::toImpl(v8::Local<v8::Object>::Cast(v8Value));
     impl.set{{member.type_name}}(cppValue);
-    return;
+    return true;
 }
 {% endmacro %}
 {% for filename in cpp_includes %}
 #include "{{filename}}"
 {% endfor %}
 
 namespace blink {
 
 {% for container in containers %}
 {{container.cpp_class}}::{{container.cpp_class}}()
@@ skipping 32 matching lines @@
 {% endfor %}
 {% if container.needs_trace %}
 void {{container.cpp_class}}::trace(Visitor* visitor)
 {
     {% for member in container.members if member.is_traceable %}
     visitor->trace(m_{{member.cpp_name}});
     {% endfor %}
 }
 
 {% endif %}
-void V8{{container.cpp_class}}::toImpl(v8::Isolate* isolate, v8::Local<v8::Value> v8Value, {{container.cpp_class}}& impl, ExceptionState& exceptionState)
+bool V8{{container.cpp_class}}::toImpl(v8::Isolate* isolate, v8::Local<v8::Value> v8Value, {{container.cpp_class}}& impl, ExceptionState& exceptionState)
 {
     if (v8Value.IsEmpty())
-        return;
+        return true;
 
     {# The numbers in the following comments refer to the steps described in
        http://heycam.github.io/webidl/#es-union
        NOTE: Step 1 (null or undefined) is handled in *OrNull::toImpl()
        FIXME: Implement all necessary steps #}
     {# 3. Platform objects (interfaces) #}
     {% for interface in container.interface_types %}
     {{assign_and_return_if_hasinstance(interface) | indent}}
 
     {% endfor %}
@@ skipping 11 matching lines @@
     {% if container.dictionary_type %}
     {# 12. Dictionaries #}
     {# FIXME: This should also check "object but not Date or RegExp". Add checks
        when we implement conversions for Date and RegExp. #}
     if (isUndefinedOrNull(v8Value) || v8Value->IsObject()) {
         {% if container.dictionary_type.type_name != 'Dictionary' %}
         {{container.dictionary_type.cpp_local_type}} cppValue;
         {% endif %}
         {{container.dictionary_type.v8_value_to_local_cpp_value}};
         impl.set{{container.dictionary_type.type_name}}(cppValue);
-        return;
+        return true;
     }
 
     {% endif %}
     {% if container.array_or_sequence_type %}
     {# 13. Arrays/Sequences #}
     {# FIXME: This should also check "object but not Date or RegExp". Add checks
        when we implement conversions for Date and RegExp. #}
     {# FIXME: Should check for sequences too, not just Array instances. #}
     if (v8Value->IsArray()) {
         {{container.array_or_sequence_type.v8_value_to_local_cpp_value}};
         impl.set{{container.array_or_sequence_type.type_name}}(cppValue);
-        return;
+        return true;
     }
 
     {% endif %}
     {# FIXME: In some cases, we can omit boolean and numeric type checks because
        we have fallback conversions. (step 17 and 18) #}
     {% if container.boolean_type %}
     {# 14. Boolean #}
     if (v8Value->IsBoolean()) {
         impl.setBoolean(v8Value->ToBoolean()->Value());
-        return;
+        return true;
     }
 
     {% endif %}
     {% if container.numeric_type %}
     {# 15. Number #}
     if (v8Value->IsNumber()) {
         {{container.numeric_type.v8_value_to_local_cpp_value}};
         impl.set{{container.numeric_type.type_name}}(cppValue);
-        return;
+        return true;
     }
 
     {% endif %}
     {% if container.string_type %}
     {# 16. String #}
     {
         {{container.string_type.v8_value_to_local_cpp_value}};
         {% if container.string_type.enum_validation_expression %}
         String string = cppValue;
         if (!({{container.string_type.enum_validation_expression}})) {
             exceptionState.throwTypeError("'" + string + "' is not a valid enum value.");
-            return;
+            return false;
         }
         {% endif %}
         impl.set{{container.string_type.type_name}}(cppValue);
-        return;
+        return true;
     }
 
     {# 17. Number (fallback) #}
     {% elif container.numeric_type %}
     {
         {{container.numeric_type.v8_value_to_local_cpp_value}};
         impl.set{{container.numeric_type.type_name}}(cppValue);
-        return;
+        return true;
     }
 
     {# 18. Boolean (fallback) #}
     {% elif container.boolean_type %}
     {
-        impl.setBoolean(v8Value->ToBoolean()->Value());
-        return;
+        impl.setBoolean(v8Value->BooleanValue());
+        return true;
     }
 
     {% else %}
     {# 19. TypeError #}
     exceptionState.throwTypeError("The provided value is not of type '{{container.type_string}}'");
+    return false;
     {% endif %}
 }
 
 v8::Local<v8::Value> toV8(const {{container.cpp_class}}& impl, v8::Local<v8::Object> creationContext, v8::Isolate* isolate)
 {
     switch (impl.m_type) {
     case {{container.cpp_class}}::SpecificTypeNone:
         {# FIXME: We might want to return undefined in some cases #}
         return v8::Null(isolate);
     {% for member in container.members %}
     case {{container.cpp_class}}::{{member.specific_type_enum}}:
         return {{member.cpp_value_to_v8_value}};
     {% endfor %}
     default:
         ASSERT_NOT_REACHED();
     }
     return v8::Local<v8::Value>();
 }
 
 {{container.cpp_class}} NativeValueTraits<{{container.cpp_class}}>::nativeValue(const v8::Local<v8::Value>& value, v8::Isolate* isolate, ExceptionState& exceptionState)
 {
     {{container.cpp_class}} impl;
     V8{{container.cpp_class}}::toImpl(isolate, value, impl, exceptionState);
     return impl;
 }
 
 {% endfor %}
 } // namespace blink