Revert "ots-roll (to r56)"
Revert "ots-roll (to r56)"

This reverts commit r77106.

Takes ots from 56 -> 50.  Win Reliability has been read since its
commit. Logs here:

http://build.chromium.org/p/chromium/builders/Win/builds/2947
http://build.chromium.org/p/chromium/builders/Win%20Reliability/builds/2491

This is a provisional revert to see if it makes things green.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/6625072

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@77224 0039d316-1c4b-4281-b951-d872f2087c98

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