Fix 64-bit clang/win build after https://codereview.chromium.org/1225183003
Fix 64-bit clang/win build after https://codereview.chromium.org/1225183003

Fixes two Wint-to-void-pointer-cast warnings.

BUG=464430,82385
TBR=liamjm@chromium.org

Review URL: https://codereview.chromium.org/1685473004 .

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#374588}

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