[heap] Make OutOfMemoryIneffectiveGC test more robust (the second try).

Change-Id: Ic10f599b6bb1c258082db61494a4e5c73220b00f
Reviewed-on: https://chromium-review.googlesource.com/1005255Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52524}

test/cctest/heap/test-heap.cc

@@ -5927,7 +5927,7 @@ UNINITIALIZED_TEST(OutOfMemoryIneffectiveGC) {
       while (heap->ms_count() < initial_ms_count + 10) {
         HandleScope inner_scope(i_isolate);
         factory->NewFixedArray(30000, TENURED);
-        if (heap->tracer()->CurrentMarkCompactMutatorUtilization() >= 0.3) {
+        if (heap->tracer()->AverageMarkCompactMutatorUtilization() >= 0.3) {
           ineffective_ms_start = heap->ms_count() + 1;
         }
       }