Re-enable SystemMonitor.* in base_unittests.
Re-enable SystemMonitor.* in base_unittests.

It was disabled in http://src.chromium.org/viewvc/chrome?view=rev&revision=16308

The root cause of crash has been fixed (see linked bug).

TEST=none
http://crbug.com/12187

Review URL: http://codereview.chromium.org/115782

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@16977 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser