Make v8::Isolate::SetRAILMode thread safe and remove the

include/v8.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.
 
 /** \mainpage V8 API Reference Guide
  *
  * V8 is Google's open source JavaScript engine.
  *
  * This set of documents provides reference material generated from the
  * V8 header file, include/v8.h.
@@ skipping 5358 matching lines @@
     void* new_code_start;
   };
 };
 
 /**
  * Option flags passed to the SetRAILMode function.
  * See documentation https://developers.google.com/web/tools/chrome-devtools/
  * profile/evaluate-performance/rail
  */
 enum RAILMode {
-  // Default performance mode: V8 will optimize for both latency and
-  // throughput in this mode.
-  PERFORMANCE_DEFAULT,
   // Response performance mode: In this mode very low virtual machine latency
   // is provided. V8 will try to avoid JavaScript execution interruptions.
   // Throughput may be throttled.
   PERFORMANCE_RESPONSE,
   // Animation performance mode: In this mode low virtual machine latency is
   // provided. V8 will try to avoid as many JavaScript execution interruptions
-  // as possible. Throughput may be throttled
+  // as possible. Throughput may be throttled. This is the default mode.
   PERFORMANCE_ANIMATION,
   // Idle performance mode: The embedder is idle. V8 can complete deferred work
   // in this mode.
   PERFORMANCE_IDLE,
   // Load performance mode: In this mode high throughput is provided. V8 may
   // turn off latency optimizations.
   PERFORMANCE_LOAD
 };
 
 /**
@@ skipping 3492 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // INCLUDE_V8_H_