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and use it everywhere to express keysets.
This CL aims to reduce the risk to pass unexpected values
to InputMethodManager::OverrideKeyboardUrlRef.

- Rename OverrideKeyboardUrlRef to OverrideKeyboardKeyset

This CL addresses the comment in crrev.com/c/950523.

Bug: 819018
Test: No behavior change. Unit tests still pass.
Change-Id: I96139abaa867c91de039113bc9006b72f210be26
Reviewed-on: https://chromium-review.googlesource.com/974668Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Yuichiro Hanada <yhanada@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545931}