Make Visitor use heap for the current thread

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

Index: third_party/WebKit/Source/platform/heap/Visitor.cpp
diff --git a/third_party/WebKit/Source/platform/heap/Visitor.cpp b/third_party/WebKit/Source/platform/heap/Visitor.cpp
index 6f5d00fbaf3f812f5692f202b3d57277f2a446e4..36498604a8a9fb8f7b3f631541261b7f5cf40e73 100644
--- a/third_party/WebKit/Source/platform/heap/Visitor.cpp
+++ b/third_party/WebKit/Source/platform/heap/Visitor.cpp
@@ -29,19 +29,19 @@ PassOwnPtr<Visitor> Visitor::create(ThreadState* state, BlinkGC::GCType gcType)
 }
 
 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