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Besides being general cleanup, this also reduces usage of kInputMethods,
global const autogen'd from deprecated input_methods.txt config file.

Bug: 1134526,1134465
Change-Id: If6b9cf19944bb622bb58d56580b229c0bed530d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2444673Reviewed-by: Keith Lee <keithlee@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: My Nguyen <myy@chromium.org>
Reviewed-by: Darren Shen <shend@chromium.org>
Commit-Queue: Bao-Duy Tran <tranbaoduy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814445}