Revert of [heap] More flag cleanup.

src/heap/memory-reducer.cc

Index: src/heap/memory-reducer.cc
diff --git a/src/heap/memory-reducer.cc b/src/heap/memory-reducer.cc
index 7f51ef29f74385200aee498370e8a58c9e297de2..4cf8bc2e3686a2571b4c7cc98a9d05c15fe11621 100644
--- a/src/heap/memory-reducer.cc
+++ b/src/heap/memory-reducer.cc
@@ -103,8 +103,8 @@
     // TODO(ulan): Replace it with incremental marking GC once
     // chromium:490559 is fixed.
     if (event.time_ms > state_.last_gc_time_ms + kLongDelayMs) {
-      heap()->CollectAllGarbage("memory reducer background GC",
-                                Heap::kReduceMemoryFootprintMask);
+      heap()->CollectAllGarbage(Heap::kReduceMemoryFootprintMask,
+                                "memory reducer background GC");
     } else {
       DCHECK(FLAG_incremental_marking);
       heap()->StartIdleIncrementalMarking();