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The same functionality is moved into MockIMEInputContextHandler by this
CL.

Bug: b:148193316
Test: browser_tests
Change-Id: Ibadbd6be50b82a923cba4c46bcc79d82aba397e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2210184
Commit-Queue: Yuichiro Hanada <yhanada@chromium.org>
Reviewed-by: Keith Lee <keithlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773595}