ARC IME: Suppress hardware key events for text input in Chrome side.
ARC IME: Suppress hardware key events for text input in Chrome side.

We used to have the suppression path inside ARC, but it turned
out it doesn't work well for several apps.

BUG=604615

Review URL: https://codereview.chromium.org/1875993002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#388403}

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