Check Windows version before attempting to detect OSK
Check Windows version before attempting to detect OSK

Fixes a crash on delay load failure for older Windows versions.

BUG=507490,491516
TBR=grt

Review URL: https://codereview.chromium.org/1229103003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#338457}

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