Remove leftover NoIncrementalWriteBarrier prototypes.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 7f373e6fc7d1d1b237a0d1eac22a0a584f9a94bf..7feec063f23bdafd20eb099911168f802f33c6d4 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -2657,13 +2657,6 @@ class FixedArray: public FixedArrayBase {
                                        int index,
                                        Object* value);
 
-  // Set operation on FixedArray without incremental write barrier. Can
-  // only be used if the object is guaranteed to be white (whiteness witness
-  // is present).
-  static inline void NoIncrementalWriteBarrierSet(FixedArray* array,
-                                                  int index,
-                                                  Object* value);
-
  private:
   STATIC_ASSERT(kHeaderSize == Internals::kFixedArrayHeaderSize);