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After crrev.com/c/1712955, //ui/base/x code can depend on X11EventSource
directly (without causing GN circular deps), making GetTimestampForXWindow
ui::XWindow::Delegate's function unneeded. So this CL removes it.

Bug: 981606
Test: None (no behavior change)
Change-Id: Ied47c2cd7bf0cccd45c0212d84de341145d89779
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1715308
Commit-Queue: Nick Yamane <nickdiego@igalia.com>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680577}