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Revert of Add Windows 10 build number to user-agent (patchset #1 id:1 of https://codereview.chromium.org/2533303003/ )

Reason for revert:
This can cause services expecting a Windows user-agent of only two version tokens (10.0) to break.

Original issue's description:
> Add Windows 10 build number to user-agent
>
> The build number would be added to the version string in UA
> only if the major version of Windows is equal or greater than 10.
> Nothing would be changed for the old version of Windows.
>
> BUG=664622
>
> Committed: https://crrev.com/bb034491431fa28ce9b2be66b17c0417dffebc13
> Cr-Commit-Position: refs/heads/master@{#437532}

TBR=jochen@chromium.org,dcheng@chromium.org,pkasting@chromium.org,rbyers@chromium.org,ratsunny@gmail.com
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=664622, 674723

Review-Url: https://codereview.chromium.org/2581033002
Cr-Commit-Position: refs/heads/master@{#438996}