Partially revert r168100
Partially revert r168100

In r168100, I mis-committed an unnecessary change to wtf/ to fix compile failure.
(The wtf/ change became unnecessary because the compile failure was fixed
in https://codereview.chromium.org/182733004/.)
This CL reverts the wtf/ part of r168100.

TBR=tkent
NOTRY=true

Review URL: https://codereview.chromium.org/176883010

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@168121 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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