Remove slow InkDrop animations

Cleans up the chrome://flags entry and removes all code that depends on
it. This was used as a debug flag.

Bug: chromium:584681, chromium:940002
Change-Id: I0b0db17246147d8d89f1b462527fc564d74402e7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1516435
Commit-Queue: Peter Boström <pbos@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#639697}
10 files changed