Make Visitor use heap for the current thread

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

 // Copyright 2016 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/Visitor.h"
 
 #include "platform/heap/BlinkGC.h"
 #include "platform/heap/MarkingVisitor.h"
 #include "platform/heap/ThreadState.h"
 
@@ skipping 11 matching lines @@
         return adoptPtr(new MarkingVisitor<Visitor::ThreadLocalMarking>(state));
     case BlinkGC::ThreadLocalWeakProcessing:
         return adoptPtr(new MarkingVisitor<Visitor::WeakProcessing>(state));
     default:
         ASSERT_NOT_REACHED();
     }
     return nullptr;
 }
 
 Visitor::Visitor(ThreadState* state, MarkingMode markingMode)
-    : m_state(state)
+    : VisitorHelper(state)
     , m_markingMode(markingMode)
 {
     // See ThreadState::runScheduledGC() why we need to already be in a
     // GCForbiddenScope before any safe point is entered.
-    m_state->enterGCForbiddenScope();
+    state->enterGCForbiddenScope();
 
-    ASSERT(m_state->checkThread());
+    ASSERT(state->checkThread());
 }
 
 Visitor::~Visitor()
 {
-    m_state->leaveGCForbiddenScope();
+    state()->leaveGCForbiddenScope();
 }
 
 } // namespace blink