Revert of "[heap] Switch to 500k pages"

test/cctest/heap/heap-utils.h

Index: test/cctest/heap/heap-utils.h
diff --git a/test/cctest/heap/heap-utils.h b/test/cctest/heap/heap-utils.h
index 753af11b1dcd2bbe5831f0765e300cc4c8d0393d..e03e6fa6e0461df12f6ec8a204a9975b782d09c8 100644
--- a/test/cctest/heap/heap-utils.h
+++ b/test/cctest/heap/heap-utils.h
@@ -14,12 +14,6 @@
 void SealCurrentObjects(Heap* heap);
 
 int FixedArrayLenFromSize(int size);
-
-// Fill a page with fixed arrays leaving remainder behind. The function does
-// not create additional fillers and assumes that the space has just been
-// sealed.
-std::vector<Handle<FixedArray>> FillOldSpacePageWithFixedArrays(Heap* heap,
-                                                                int remainder);
 
 std::vector<Handle<FixedArray>> CreatePadding(
     Heap* heap, int padding_size, PretenureFlag tenure,