Update Win32k lockdown for PPAPI for new process creation codes. This patch corrects the behaviour of the call to AddWin32kLockdownPolicy so it checks the correct return code.
Update Win32k lockdown for PPAPI for new process creation codes.
This patch corrects the behaviour of the call to AddWin32kLockdownPolicy
so it checks the correct return code.

BUG=526198

Review-Url: https://codereview.chromium.org/1961473002
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#392191}

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