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UpdateX11EventForChangedButtonFlags function is not used anywhere and
UpdateX11EventForFlags is used in one unittest but with no effect
(native_event() returns null) so remove both.

Bug: 965991
Change-Id: Ida9b30be22a13cc8cdb2cac424b1968754aa3021
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1785182Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Nick Yamane <nickdiego@igalia.com>
Cr-Commit-Position: refs/heads/master@{#693757}