Remove LeftTrimFixedArray

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index 8e1e4f6104dc21c3c0993a69f91e640fd858dcbf..44b0a7204a803664d0a9e003dfad0114de40993a 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -822,10 +822,6 @@ class Heap {
   // Maintain consistency of live bytes during incremental marking.
   void AdjustLiveBytes(HeapObject* object, int by, InvocationMode mode);
 
-  // Trim the given array from the left. Note that this relocates the object
-  // start and hence is only valid if there is only a single reference to it.
-  FixedArrayBase* LeftTrimFixedArray(FixedArrayBase* obj, int elements_to_trim);
-
   // Trim the given array from the right.
   template<Heap::InvocationMode mode>
   void RightTrimFixedArray(FixedArrayBase* obj, int elements_to_trim);