Consistently use BYTE* instead of PBYTE in openssl_platform_key_win.cc.
Consistently use BYTE* instead of PBYTE in openssl_platform_key_win.cc.

Right now it's a bit of a mix. Google style says using types like DWORD and
HANDLE is encouraged, but const TCHAR * is prefered over LPCTSTR, though
Chromium is not consistent about this with interesting types like
PCERT_CONTEXT. We do fairly consistently use BYTE* over PBYTE, so at least
standardize that one.

BUG=none

Review URL: https://codereview.chromium.org/1149963005

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#333376}

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