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This CL deletes "win" and "linux" specific functions in chrome.input.ime,
which resulted in a chain reaction of deletions, including InputImeApi,
InputMethodEngine and UI code.

This CL is intentionally kept as small as possible. There will be
additional cleanups in the future.

Proposal doc: http://doc/1eIsYPs2JhzQ8qmM-96amsashfFmAAC9xoYRmY2CIjtM

Change-Id: I689badba5157f76b5a92d6a9b705a198760e7f00
Bug: 1083803
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2198861
Commit-Queue: Darren Shen <shend@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: Shu Chen <shuchen@chromium.org>
Reviewed-by: Keith Lee <keithlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771457}