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InputMethodManagerImpl unit tests are failing in certain environment due
to mixed usage of hermetic test data and non-hermetic CrOS-specific prod
data, with inconsistent direct tweaking on an internal delegate.

This refactoring doesn't fix the failures as yet but facilitates the
move towards consistent usage of hermetic test data in follow-ups.

Bug: 970790
Change-Id: I892aeaddf3658c6ab0f2d35ab441a2fa85858c0c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2550146
Commit-Queue: Bao-Duy Tran <tranbaoduy@chromium.org>
Reviewed-by: Keith Lee <keithlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830899}