Remove SafePointBarrier

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

-// 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.
-
-#include "platform/heap/SafePoint.h"
-
-#include "platform/heap/Heap.h"
-
-namespace blink {
-
-using PushAllRegistersCallback = void (*)(SafePointBarrier*,
-                                          ThreadState*,
-                                          intptr_t*);
-extern "C" void pushAllRegisters(SafePointBarrier*,
-                                 ThreadState*,
-                                 PushAllRegistersCallback);
-
-SafePointBarrier::SafePointBarrier() {}
-
-SafePointBarrier::~SafePointBarrier() {}
-
-void SafePointBarrier::enterSafePoint(ThreadState* state) {
-  ASSERT(!state->sweepForbidden());
-  pushAllRegisters(this, state, enterSafePointAfterPushRegisters);
-}
-
-void SafePointBarrier::leaveSafePoint() {}
-
-void SafePointBarrier::doEnterSafePoint(ThreadState* state,
-                                        intptr_t* stackEnd) {
-  state->recordStackEnd(stackEnd);
-  state->copyStackUntilSafePointScope();
-}
-
-}  // namespace blink