Remove SafePointBarrier

third_party/WebKit/Source/platform/heap/SafePoint.h

 // Copyright 2015 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.
 
 #ifndef SafePoint_h
 #define SafePoint_h
 
 #include "platform/heap/ThreadState.h"
 #include "wtf/ThreadingPrimitives.h"
 
@@ skipping 14 matching lines @@
 
   ~SafePointScope() {
     if (m_state)
       m_state->leaveSafePoint();
   }
 
  private:
   ThreadState* m_state;
 };
 
-class SafePointBarrier final {
-  USING_FAST_MALLOC(SafePointBarrier);
-  WTF_MAKE_NONCOPYABLE(SafePointBarrier);
-
- public:
-  SafePointBarrier();
-  ~SafePointBarrier();
-
-  void enterSafePoint(ThreadState*);
-  void leaveSafePoint();
-
- private:
-  void doPark(ThreadState*, intptr_t* stackEnd);
-  void doEnterSafePoint(ThreadState*, intptr_t* stackEnd);
-  static void enterSafePointAfterPushRegisters(SafePointBarrier* barrier,
-                                               ThreadState* state,
-                                               intptr_t* stackEnd) {
-    barrier->doEnterSafePoint(state, stackEnd);
-  }
-  Mutex m_mutex;
-};
-
 }  // namespace blink
 
 #endif