[runtime] Remove redundant StoreMode enum.

test/cctest/test-unboxed-doubles.cc

Index: test/cctest/test-unboxed-doubles.cc
diff --git a/test/cctest/test-unboxed-doubles.cc b/test/cctest/test-unboxed-doubles.cc
index c2544f0e253788a75e491d73deece49e7075cf28..582e2757fbd297e30e6b0659091485488629a23e 100644
--- a/test/cctest/test-unboxed-doubles.cc
+++ b/test/cctest/test-unboxed-doubles.cc
@@ -1534,7 +1534,7 @@ static void TestWriteBarrierObjectShiftFieldsRight(
 
   // Shift fields right by turning constant property to a field.
   Handle<Map> new_map = Map::ReconfigureProperty(
-      map, 0, kData, NONE, Representation::Tagged(), any_type, FORCE_FIELD);
+      map, 0, kData, NONE, Representation::Tagged(), any_type);
 
   if (write_barrier_kind == OLD_TO_NEW_WRITE_BARRIER) {
     TestWriteBarrier(map, new_map, 2, 1);