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This change is part of a larger refactor to remove
InputMethodEngineBase::KeyboardEvent in favour of ui::KeyEvent.

Assistive suggesters use KeyboardEvent.key, which, for special keys like
the arrow keys, are actually based off KeyboardEvent.code (with some
variations like Escape -> Esc):
https://source.chromium.org/chromium/chromium/src/+/master:chrome/browser/chromeos/input_method/input_method_engine_base.cc;l=42;drc=5af06c5ea5983c42aecf4ac02ba38730a51bed6b

Change the suggesters to use code so that it's easier to switch to
ui::KeyEvent.

This is a mechanical change:
- If the key is Up/Down/Left/Right, then the code is Arrow + key:
https://source.chromium.org/chromium/chromium/src/+/master:chrome/browser/chromeos/input_method/input_method_engine_base.cc;l=50;drc=5af06c5ea5983c42aecf4ac02ba38730a51bed6b

- If the key is Esc, the code is Escape:
https://source.chromium.org/chromium/chromium/src/+/master:chrome/browser/chromeos/input_method/input_method_engine_base.cc;l=52;drc=5af06c5ea5983c42aecf4ac02ba38730a51bed6b

- If the key is Enter, the code is Enter:
https://source.chromium.org/chromium/chromium/src/+/master:chrome/browser/chromeos/input_method/input_method_engine_base.cc;l=55;drc=5af06c5ea5983c42aecf4ac02ba38730a51bed6b

Bug: b/174612548
Change-Id: Ib2dd08925546229567df07b0a9d427e67ef0b24b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2568910Reviewed-by: My Nguyen <myy@chromium.org>
Commit-Queue: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832656}