Fix detection of Visual Studio version.
Fix detection of Visual Studio version.

BUG=None
TEST=None
Review URL: http://codereview.chromium.org/2848040/show


git-svn-id: e7e1075985beda50ea81ac4472467b4f6e91fc78@846 78cadc50-ecff-11dd-a971-7dbc132099af

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