[heap] delete Heap::LeftTrimFixedAray

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index 071681076fc60b37a82b34be8ae3706e4ba4aa5a..b92a44a0d716dcc2fc88f93bcfe4a99e7a5d363c 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -827,15 +827,9 @@ class Heap {
   // when introducing gaps within pages.
   void CreateFillerObjectAt(Address addr, int size);
 
-  bool CanMoveObjectStart(HeapObject* object);
-
   // 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);