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OOP PDF is now enabled by default, so remove the check in ChromeBrowserMainPartsWin::PreCreateThreads

BUG=442157
TEST=launch with --enable-win32k-renderer-lockdown or --force-fieldtrials=Win32kLockdown/Enabled/ check chrome://histograms that Win32k lockdown is enabled.  Check OOP PDF still works both with and without --disable-direct-write switch.

Review URL: https://codereview.chromium.org/872673002

Cr-Commit-Position: refs/heads/master@{#313423}