Deflake success: fast/js/toString-and-valueOf-override.html is not slow
Deflake success: fast/js/toString-and-valueOf-override.html is not slow

This patch removes fast/js/toString-and-valueOf-override.html from
the SlowTests file after http://src.chromium.org/viewvc/blink?view=rev&rev=185881
made it fast.

NOTRY=true
TBR=tasak
BUG=435774

Review URL: https://codereview.chromium.org/754293002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@185918 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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