Polish Maybe API a bit, removing useless creativity and fixing some signatures.

src/runtime/runtime-object.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/arguments.h"
 #include "src/bootstrapper.h"
 #include "src/debug.h"
 #include "src/runtime/runtime.h"
@@ skipping 754 matching lines @@
 
   uint32_t index;
   const bool key_is_array_index = key->AsArrayIndex(&index);
 
   // Only JS objects can have properties.
   if (object->IsJSObject()) {
     Handle<JSObject> js_obj = Handle<JSObject>::cast(object);
     // Fast case: either the key is a real named property or it is not
     // an array index and there are no interceptors or hidden
     // prototypes.
-    Maybe<bool> maybe;
+    Maybe<bool> maybe = Nothing<bool>();
     if (key_is_array_index) {
       maybe = JSObject::HasOwnElement(js_obj, index);
     } else {
       maybe = JSObject::HasRealNamedProperty(js_obj, key);
     }
     if (!maybe.has_value) return isolate->heap()->exception();
     DCHECK(!isolate->has_pending_exception());
     if (maybe.value) {
       return isolate->heap()->true_value();
     }
@@ skipping 785 matching lines @@
   CONVERT_PROPERTY_ATTRIBUTES_CHECKED(attrs, 3);
 
   RETURN_FAILURE_ON_EXCEPTION(
       isolate,
       JSObject::DefineAccessor(object, name, isolate->factory()->null_value(),
                                setter, attrs));
   return isolate->heap()->undefined_value();
 }
 }
 }  // namespace v8::internal