Add #if defined(OS_WIN) for the previous change, which only applies to Windows.  I forgot that this file is used by all platforms.
Add #if defined(OS_WIN) for the previous change, which only
applies to Windows.  I forgot that this file is used by all
platforms.

R=eroman
http://crbug.com/5234
TEST=N/A
Review URL: http://codereview.chromium.org/113729

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@16695 0039d316-1c4b-4281-b951-d872f2087c98

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