Combine RegKeyTests to prevent parallel execution.
Combine RegKeyTests to prevent parallel execution.

Executing these tests in parallel causes failures due to conflicting
registry keys, combining them to unblock launching a parallel win32 bot.
Ideally these keys would be generated differently per-process and not
conflict at all (so it can be run in parallel repeatedly alongside itself).

BUG=4162
R=kjellander@webrtc.org
TBR=pthatcher@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/36749004

git-svn-id: 03ae4fbe531b1eefc9d815f31e49022782c42458@8055 4adac7df-926f-26a2-2b94-8c16560cd09d

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