Oilpan: Query stack frame register instead of manual bookkeeping

Source/platform/heap/InlinedGlobalMarkingVisitor.h

 // Copyright 2014 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 InlinedGlobalMarkingVisitor_h
 #define InlinedGlobalMarkingVisitor_h
 
 #include "platform/heap/MarkingVisitorImpl.h"
 
 namespace blink {
@@ skipping 32 matching lines @@
         Impl::mark(objectPointer, callback);
     }
 
     using VisitorHelper<Visitor>::registerWeakMembers;
     inline void registerWeakMembers(const void* closure, const void* objectPointer, WeakPointerCallback callback)
     {
         Impl::registerWeakMembers(closure, objectPointer, callback);
     }
 
     inline bool canTraceEagerly() const { return m_visitor->canTraceEagerly(); }
-    inline void incrementTraceDepth() { m_visitor->incrementTraceDepth(); }
-    inline void decrementTraceDepth() { m_visitor->decrementTraceDepth(); }
 
     Visitor* getUninlined() { return m_visitor; }
 
 protected:
     // Methods to be called from MarkingVisitorImpl.
 
     inline bool shouldMarkObject(const void*)
     {
         // As this is global marking visitor, we need to mark all objects.
         return true;
@@ skipping 40 matching lines @@
 
     inline static void trace(InlinedGlobalMarkingVisitor visitor, T* self)
     {
         self->trace(visitor);
     }
 };
 
 } // namespace blink
 
 #endif