[BRP] Remove PaintManager::instance_ exception

The file is under ppapi/, which is excluded from rewrite entirely

Bug: 348793153
Change-Id: I3f0e701685fedcb0af3417823481165b5662222e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5653850
Auto-Submit: Bartek Nowierski <bartekn@chromium.org>
Commit-Queue: Keishi Hattori <keishi@chromium.org>
Reviewed-by: Keishi Hattori <keishi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1319317}
NOKEYCHECK=True
GitOrigin-RevId: 2822a2bdfa3ac853e69ce8add64d789335e9b1d2
1 file changed