STR: 1. Open https://twitter.com/ and log into it. 2. Set focus to the editor to tweet. 3. Input "テスト" and commit it. 4. Input "テスト" again and commit it. 5. Press Ctrl+Backspace Expected result: 2nd "テスト" becomes marked text and it's impossible to convert it to other string. Actual result: Nothing happened and cannot move focus with arrow keys anymore. I think that the editor to tweet hacks something. Therefore, it may be okay not to be able to do "Kakutei-Undo" but we should avoid the latter issue. I reproduce this bug either in e10s mode nor non-e10s mode.
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