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Previously we had both kEnableVizHitTestDrawQuad (VizHitTesting v1) and
kEnableVizHitTestSurfaceLayer(v2). After v1 being shipped, the function
IsVizHitTestingDrawQuadEnabled() was no longer useful. It just returns
!IsVizHitTestingSurfaceLayerEnabled().

Bug: 917015
Change-Id: Id7791763704235238cf0cfbc91bbf580128fa543
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1762588Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Yi Gu <yigu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688705}