Remove "extra checks"

src/objects-inl.h

 // Copyright 2012 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.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 2219 matching lines @@
   if (!js_value->value()->IsString()) return false;
 
   String* str = String::cast(js_value->value());
   if (index >= static_cast<uint32_t>(str->length())) return false;
 
   return true;
 }
 
 
 void Object::VerifyApiCallResultType() {
-#if ENABLE_EXTRA_CHECKS
+#if DEBUG
   if (!(IsSmi() ||
         IsString() ||
         IsSymbol() ||
         IsSpecObject() ||
         IsHeapNumber() ||
         IsUndefined() ||
         IsTrue() ||
         IsFalse() ||
         IsNull())) {
     FATAL("API call returned invalid object");
   }
-#endif  // ENABLE_EXTRA_CHECKS
+#endif  // DEBUG
 }
 
 
 Object* FixedArray::get(int index) const {
   SLOW_DCHECK(index >= 0 && index < this->length());
   return READ_FIELD(this, kHeaderSize + index * kPointerSize);
 }
 
 
 Handle<Object> FixedArray::get(Handle<FixedArray> array, int index) {
@@ skipping 5247 matching lines @@
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_