Revert "[Sheriff] Mark profviz flaky on GC stress."

This reverts commit f70687c1e5ef15254887e0619939e25a834e936e.

BUG=
R=machenbach@chromium.org

Review URL: https://codereview.chromium.org/148493006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18977 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/mjsunit/mjsunit.status

@@ -127,9 +127,6 @@
   'osr-elements-kind': [SKIP],
   'regress/regress-165637': [SKIP],
   'regress/regress-2249': [SKIP],
-
-  # TODO(hpayer): Investigate.
-  'tools/profviz': [PASS, FLAKY],
 }],  # 'gc_stress == True'
 
 ##############################################################################