Fix XP support when building with VS 2013.
Fix XP support when building with VS 2013.

This is a copy of https://codereview.chromium.org/58853015/

R=chrisha@chromium.org, siggi@chromium.org
BUG=

Review URL: https://codereview.appspot.com/38620043

git-svn-id: db59699583a60be9a535cd09cdc9132301867226@1936 15e8cca8-e42c-11de-a347-f34a4f72eb7d

supriyantomaftuh/syzygy,pombreda/syzygy,supriyantomaftuh/syzygy,wangming28/syzygy,ericmckean/syzygy,google/syzygy,google/syzygy,wangming28/syzygy,google/syzygy,pombreda/syzygy,sebmarchand/syzygy,pombreda/syzygy,sebmarchand/syzygy,google/syzygy,Eloston/syzygy,pombreda/syzygy,ericmckean/syzygy,sebmarchand/syzygy,pombreda/syzygy,supriyantomaftuh/syzygy,ericmckean/syzygy,wangming28/syzygy,ericmckean/syzygy,wangming28/syzygy,supriyantomaftuh/syzygy,sebmarchand/syzygy,sebmarchand/syzygy,ericmckean/syzygy,Eloston/syzygy