Gardening: inspector-protocol/heap-profiler/heap-objects-tracking.html is flaky

BUG=344239
TBR=yurys@chromium.org

Review URL: https://codereview.chromium.org/169163002

git-svn-id: svn://svn.chromium.org/blink/trunk@167253 bbb929c8-8fbe-4397-9dbb-9b2b20218538