Cleanup after inobject slack tracking improvement.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index f82b9af6b4700cdc87d4699976cad63943808ca3..7a3e07a97a52ce526f30b240bbc847f93907fc87 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -2635,6 +2635,10 @@ class JSObject: public JSReceiver {
   // permissible values (see the ASSERT in heap.cc).
   static const int kInitialMaxFastElementArray = 100000;
 
+  // This constant applies only to the initial map of "$Object" aka
+  // "global.Object" and not to arbitrary other JSObject maps.
+  static const int kInitialGlobalObjectUnusedPropertiesCount = 4;
+
   static const int kFastPropertiesSoftLimit = 12;
   static const int kMaxFastProperties = 128;
   static const int kMaxInstanceSize = 255 * kPointerSize;
@@ -6966,10 +6970,6 @@ class SharedFunctionInfo: public HeapObject {
   // TypeFeedbackInfo::feedback_vector, but the allocation is done here.
   DECL_ACCESSORS(feedback_vector, FixedArray)
 
-  // Invoked before pointers in SharedFunctionInfo are being marked.
-  // Also clears the optimized code map.
-  inline void BeforeVisitingPointers();
-
   // [instance class name]: class name for instances.
   DECL_ACCESSORS(instance_class_name, Object)