Remove now-unused Visitor::m_isGlobalMarkingVisitor field.

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

Index: third_party/WebKit/Source/platform/heap/Visitor.h
diff --git a/third_party/WebKit/Source/platform/heap/Visitor.h b/third_party/WebKit/Source/platform/heap/Visitor.h
index 5f6a367b65dfd632a99ed475edab40a8b97e9500..a683882c926ccb0e4ed8072dd8d05ec109eec189 100644
--- a/third_party/WebKit/Source/platform/heap/Visitor.h
+++ b/third_party/WebKit/Source/platform/heap/Visitor.h
@@ -33,14 +33,10 @@
 
 #include "platform/PlatformExport.h"
 #include "platform/heap/GarbageCollected.h"
-#include "platform/heap/StackFrameDepth.h"
-#include "platform/heap/ThreadState.h"
 #include "wtf/Allocator.h"
 #include "wtf/Assertions.h"
-#include "wtf/Atomics.h"
 #include "wtf/Deque.h"
 #include "wtf/Forward.h"
-#include "wtf/HashMap.h"
 #include "wtf/HashTraits.h"
 #include "wtf/TypeTraits.h"
 
@@ -385,7 +381,6 @@ private:
 
     ThreadState* m_state;
     const MarkingMode m_markingMode;
-    bool m_isGlobalMarkingVisitor;

[haraken, 2016/03/04 15:55:59]

Hmm, I remember kouhei@ introduced this flag for optimizing the marking phase.
Would you quickly blame a CL that removes the usage of m_isGlobalMarkingVisitor?

[sof, 2016/03/04 18:18:23]

Yes, introduced in https://codereview.chromium.org/804303002 and no longer used
after https://codereview.chromium.org/1168683002

 };
 
 } // namespace blink